1-4 – College swimming and diving, NAIA Championships, Burnaby, British Columbia.
2 – Pro football, NFL free agency period begins.
2 – Track and field, IAAF Grand Prix II, Melbourne Track Classic, Melbourne, Australia.
2-4 – Women's golf, LPGA Tour, Takefuji Classic, Kailua-Kona, Hawaii
2-5 – Men's golf, PGA Tour, Doral-Ryder Open, Miami.
2-5 – Men's golf, BUY.COM Tour, Mississippi Gulf Coast Open, Pass Christian, Miss.
2-5 – Men's golf, European PGA, Dubai Desert Classic, Dubai, United Arab Emirates.
2-5 – Men's golf, Australiasian PGA Tour, The Tour Championship, TBA.
2-5 – Figure skating, U.S. Synchronized Team Championships, Plymouth, Mich.
3 – Snowboarding, World Cup, men's and women's giant slalom, Park City, Utah.
3 – Cross-country skiing, World Cup, men's and women's sprint, Lahti, Finland.
3-4 – Men's skiing, World Cup nordic combined, Lahti, Finland.
3-4 – College wrestling, NCAA Division III Championships, Ada, Ohio.
3-4 – College wrestling, NAIA Championships, St. Charles, Mo.
3-4 – Track and Field, U.S. Indoor Championships, Atlanta.
3-5 – Men's golf, PGA Senior Tour, Toshiba Senior Classic, Newport Beach, Calif.
3-5 – Ski jumping, World Cup, Lahti, Finland.
3-5 – Diving, FINA Grand Prix, Rostock, Germany.
3-5 – Speedskating, World Single Distance Championships, Nagano, Japan.
3-11 – Curling, U.S. Nationals, Ogden, Utah.
4 – Auto racing, NASCAR Busch Series, Las Vegas
4 – Snowboarding, World Cup, men's and women's snowboardcross, Park City, Utah.
4 – Cross-country skiing, World Cup, men's 30km classic and women's 4x5 relay, Lahti, Finland.
4 – Men's skiing, World Cup alpine, downhill, Kvitfjell, Norway.
4 – Women's skiing, World Cup alpine, downhill, Lenzerheide, Switzerland.
4 – Freestyle skiing, World Cup, men's and women's acrobatic, Ovindoli, Italy.
4 – Speedskating, World Short Track Team Championships, The Hague, Netherlands.
4 – Triathlon, Winter Triathlon World Championships, Jaca, Spain.
4-5 – Track and field, ECAC Indoor, Boston.
5 – Auto racing, NASCAR Winston Cup, Las Vegas 400.
5 – Snowboarding, World Cup, men's and women's half pipe, Park City, Utah.
5 – Cross-country skiing, World Cup, men's 4x10 relay and women's 15km classic, Lahti, Finland.
5 – Men's skiing, World Cup alpine, super G, Kvitfjell, Norway.
5 – Women's skiing, World Cup alpine, super G, Lenzerheide, Switzerland.
5 – Running, Los Angeles Marathon.
5 – Running, Medcom Marathon, San Antonio.
5-12 – Cycling, Paris-Nice Classic, Paris-Nice, France.
6-12 – Men's tennis, ATP event, Scottsdale, Ariz.
6-12 – Men's tennis, ATP event, Bogota, Colombia.
8 – Cross-country skiing, World Cup, sprint, Oslo, Norway.
8-11 – College skiing, men's and women's NCAA Championships, Park City, Utah.
8-11 – Men's and women's college swimming and diving, NCAA Division II Championships, Buffalo, N.Y.
8-11 – Cross-country skiing, Nordic World Cup men and women, Oslo, Norway.
8-14 – Men's College basketball NAIA Division II Championships, Point Lookout, Mo.
8-14 – Women's College basketball NAIA Division II Championships, Sioux City, Iowa.
9 – Men's skiing, World Cup alpine, slalom, Schladming, Austria.
9-11 – College rifle, men's and women's NCAA Championships, Lexington, Va.
9-11 – Women's college swimming and diving, NCAA Division III Championships, Atlanta.
9-12 – Men's golf, PGA Tour, Honda Classic, Coral Springs, Fla.
9-12 – Women's golf, LPGA Tour, Welch's/Circle K Championship, Tucson, Ariz.
9-12 – Men's golf, European PGA, Qatar Masters, Doha, Qatar.
9-12 – Diving, FINA World Cup, Moscow.
9-12 – Biathlon, World Cup, Lahti, Finland.
9-20 – Field hockey, Men's Olympic Qualifying Tournament, Osaka, Japan.
10 – Ski jumping, World Cup, Trondheim, Norway.
10 – Snowboarding, World Cup, men's and women's parallel slalom, San Candido/Sexten, Italy.
10-11 – Men's and women's college track, NCAA Division I Indoor Championships, Fayetteville, Ark.
10-11 – Men's and women's college track, NCAA Division II Indoor Championships, Boston.
10-11 – Men's and women's college track, NCAA Division III Indoor Championships, Bloomington, Ill.
10-11 – College wrestling, NCAA Division II Championships, Brookings, S.D.
10-11 – Men's skiing, World Cup nordic combined, Oslo, Norway.
10-12 – Men's golf, PGA Senior Tour, La Vista Seniors, TBA
10-12 – Weightlifting, U.S. National Championships, Frederick, Md.
10-12 – Speedskating, Short Track World Championships, Sheffield, England.
10-12 – Archery, U.S. Indoor Championships, Harrisonburg, Va. and Visalia, Calif.
10-19 – Men's and women's tennis, Newsweek Champions Cup, Indian Wells, Calif.
11 – Auto racing, NASCAR Busch Series, Hampton, Ga.
11 – Cross-country skiing, World Cup, men's 50km classic and women's 30km classic, Oslo, Norway.
11 – Snowboarding, World Cup, men's and women's half pipe, San Candido/Sexten, Italy.
11 – Men's skiing, World Cup alpine, giant slalom, Hinterstoder, Austria.
12 – Auto racing, Formula I, Australian Grand Prix, Melbourne.
12 – Auto racing, NASCAR Winston Cup, Cracker Barrel 500, Hampton, Ga.
12 – Men's and women's College basketball, NCAA Division I tournament pairings announced.
12 – Snowboarding, World Cup, men's and women's snowboardcross, San Candido/Sexten, Italy.
12 – Ski jumping, World Cup, Oslo, Norway.
12-15 – World Sports Forum, St. Moritz, Switzerland.
14 – Pro hockey, NHL trading deadline.
14-18 – Pro football, NFL Annual Meeting, Palm Beach, Fla.
14-20 – Men's College basketball, NAIA Division I Championships, Tulsa, Okla.
15 – Men's and women's skiing, World Cup alpine, men's and women's downhill, Bormio, Italy.
15-17 – Freestyle skiing, World Cup, men's and women's acrobatic; men's and women's dual moguls; men's and women's moguls, men's and women's aerials, Livigno, Italy.
15-21 – Women's College basketball, NAIA Division I Championships, Jackson, Tenn.
16 – Men's College basketball, NCAA Division I basketball tournament starts, various sites.
16 – Men's and women's skiing, World Cup alpine, men's super G and women's super G, Bormio, Italy.
16 – Snowboarding, World Cup, men's and women's parallel slalom, Livigno, Italy.
16-17 – Men's skiing, World Cup nordic combined, St. Caterina/St. Moritz, Italy.
16-18 – Women's college swimming and diving, NCAA Division I Championships, Bloomington, Ind.
16-18 – Men's college swimming and diving, NCAA Division III Championships, Atlanta.
16-18 – College wrestling, NCAA Division I Championships, St. Louis
16-18 – Synchronized swimming, U.S. Collegiate Championships, Columbus, Ohio.
16-19 – Men's golf, PGA Tour, Bay Hill Invitational, Orlando, Fla.
16-19 – Men's golf, BUY.COM Tour, Monterrey (Mexico) Open.
16-19 – Women's golf, LPGA Tour, Standard Register Ping, Phoenix.
16-19 – Men's golf, European PGA, Madeira Island Open, Santo da Serra, Medeira, Portugal.
16-19 – Auto racing, NHRA, MAC Tools Gatornationals, Gainesville, Fla.
16-19 – Biathlon, World Cup, Khanty-Mansiysk, Russia.
16-19 – Swimming, World Short-Course Championships, Athens, Greece.
16-19 – Auto racing, Portuguese Rally, various site, Portugal.
17 – Women's College basketball, NCAA Division I basketball tournament starts, various sites.
17 – Snowboarding, World Cup, men's and women's snowboardcross, Livigno, Italy.
17 – Cross-country skiing, World Cup, men's 10km classic and women's 5 km classic, Bormio, Italy.
17-18 – Men's College basketball, NCAA Division III Championship, Salem, Va.
17-18 – Women's College basketball, NCAA Division III Championship, Danbury, Conn.
17-18 – College ice hockey, NCAA Division III Championships, TBA.
17-19 – Men's golf, PGA Senior Tour, Liberty Mutual Legends of golf, St. Augustine, Fla.
17-19 – Diving, FINA Grand Prix, Sheffield, England.
18 – Auto racing, NASCAR Trucks, Phoenix.
18 – Auto racing, NASCAR Busch Series, Darlington, S.C.
18 – Cross-country skiing, World Cup, women's 10km freestyle, Bormio, Italy.
18 – Snowboarding, World Cup, men's and women's giant slalom and half pipe, Livigno, Italy.
18 – Men's and women's skiing, World Cup alpine, men's giant slalom and women's giant slalom, Bormio, Italy.
18-19 – Ski jumping, World Cup, Planica, Slovenia.
18-19 – Running, IAAF World Cross Country, IAAF World Championships, Vilamoura, Portugal.
19 – Men's and women's skiing, World Cup alpine, men's slalom and women's slalom, Bormio, Italy.
19 – Cross-country skiing, World Cup, men's 15km freestyle, Bormio, Italy.
19 – Auto racing, NASCAR Winston Cup, TranSouth 400, Darlington, S.C.
19 – Auto racing, IRL, Phoenix International Raceway.
19 – Motorcycle racing, South African Grand Prix, Welkom, South Africa.
20-26 – Ice hockey, Women's World Senior Championship (Pool B), Riga and Liepaja Latvia.
23-25 – Men's college swimming and diving, NCAA Division I Championships, Minneapolis.
23-26 – Men's and women's fencing, NCAA Championships, TBA.
23-26 – Men's golf, PGA Tour, THE PLAYERS Championship, Ponte Vedra Beach, Fla.
23-26 – Women's golf, LPGA Tour, Nabisco Championship, Rancho Mirage, Calif.
23-April 2 – Field hockey, Women's Olympic Qualifying Tournament, Milton Keynes, England.
24 – Track and field, IAAF Grand Prix II, Engen Grand Prix, Pretoria, South Africa.
24-26 – Men's golf, PGA Senior Tour, Emerald Coast Classic, Milton, Fla.
24-April 2 – Men's and women's tennis, The Ericcson Open, Miami.
25 – Auto racing, NASCAR Trucks, Bakersfield, Calif.
25 – Auto racing, NASCAR Busch Series, Bristol, Tenn.
25 – Men's College basketball, NCAA Division II Championship, Louisville, Ky.
25 – Women's College basketball, NCAA Division II Championship, Pine Bluff, Ark.
25 – Horse racing, Dubai World Cup, Dubai, United Arab Emirates.
25-April 2 – U.S. Olympic trials, sailing (Tornado), Santa Cruz, Calif.
26 – Running, Turin (Italy) Marathon.
26 – Auto racing, CART, Marlboro Grand Prix of Miami, Homestead, Fla.
26 – Auto racing, Formula I, Brazilian GP, Sao Paolo.
26 – Auto racing, NASCAR Winston Cup, Food City 500, Bristol, Tenn.
26-28 – Women's college rowing, NCAA Championships, Camden, N.J.
26-April 2 – Figure skating, World Championships, Nice, France.
28-April 1 – Swimming, Phillips 66 National Championships, Federal Way, Wash.
29 – Major League Baseball, opening day.
30-April 2 – Men's golf, PGA Tour, BellSouth Classic, Duluth, Ga.
30-April 2 – Men's golf, BUY.COM Tour, Louisiana Open, Broussard, La.
30-April 2 – Men's golf, European PGA, Brazil 500 Years Open, Sao Paulo, Brazil.
30-April 2 – Auto racing, Spanish Rally, various sites, Spain.
31 – Women's College basketball, NCAA Division I Championship semifinals, Philadelphia.
31 – Track and field, IAAF, Engen Grand Prix Final, Cape Town, South Africa.
31-April 1 – Men's college gymnastics, NCAA Championships, Iowa City.
31-April 2 – Men's golf, PGA Senior Tour, The Countrywide Tradition, Scottsdale, Ariz.