1-7 — Tennis, WTA Tour Qatar Total Open, Doha, Qatar.
1-7 — Tennis, ATP Dubai Duty Free Men's Open, Dubai, United Arab Emirates.
1-7 — Tennis, ATP Franklin Templeton Tennis Classic, Scottsdale, Ariz.
1-7 — Tennis, ATP-WTA Tour Abierto Mexicano Pegaso, Acapulco, Mexico.
1-8 — Table tennis, World Team Championships, Doha, Qatar.
3 — Pro football, NFL free agency and trading period begins.
3 — Major League Baseball, mandatory reporting date.
3-6 — College swimming and diving, NAIA Championships, Lawrence, Kan.
3-6 — Biathlon, World Cup, Fort Kent, Maine.
3-7 — Men's bowling, PBA Uniroyal Tire Classic, Indianapolis.
4-6 — Men's and women's track and field, NAIA Indoor Championships, Johnson City, Tenn.
4-7 — Men's golf, European PGA, Dubai Desert Classic, Dubai, United Arab Emirates.
4-7 — Men's golf, PGA Tour, Ford Championship, Miami.
5-6 — Men's skiing, World Cup nordic combined, Lahti, Finland.
5-6 — College wrestling, NCAA Division III championships, Dubuque, Iowa.
5-7 — Track and field, IAAF Indoor, World Championships, Budapest, Hungary.
5-7 — Men's golf, PGA Champions, MasterCard Classic, Lomas Altas, Mexico.
5-7 — Auto racing, NHRA, Checker Schuck's Kragen Nationals, Phoenix.
5-7 — Snowboarding, World Cup, Mount Bachelor, Oregon.
5-7 — Diving, FINA Grand Prix, Rostock, Germany.
5-7 — Cross-country skiing, World Cup, Lahti, Finland.
6 — Auto racing, NASCAR Busch, Sam's Town 300, Las Vegas.
6-7 — Men's skiing, World Cup alpine, downhill and super-G, Kvitfjell, Norway.
6-7 — Freestyle skiing, World Cup, Airolo, Switzerland.
6-7 — Ski jumping, World Cup, Lahti, Finland.
7 — Auto racing, NASCAR Nextel Cup, UAW-DaimlerChrysler 400, Las Vegas.
7 — Auto racing, Formula One, Australian Grand Prix, Melbourne.
7 — Running, Los Angeles Marathon.
7 — Athletics, cross country Grand Prix, San Vittore, Italy.
9 — Pro hockey, NHL trading deadline.
10 — Ski jumping, World Cup, Kuopio, Finland.
10-13 — College skiing, men's and women's NCAA championships, Truckee, Calif.
10-13 — Men's and women's college swimming and diving, NCAA Division II championships, Buffalo, N.Y.
10-14 — Freestyle skiing, World Cup, Sestrieres, Italy.
10-14 — Men's and women's skiing, World Cup alpine, downhill, slalom, super-G, giant slalom (men and women), Sestrieres, Italy.
10-16 — Men's college basketball NAIA Division II Championships, Point Lookout, Mo.
10-16 — Women's college basketball NAIA Division II Championships, Sioux City, Iowa.
11 — Ski jumping, World Cup, Lillehammer, Norway.
11-13 — Women's college swimming and diving, NCAA Division III championships, St. Peter's, Mo.
11-13 — College rifle, men's and women's NCAA championships, TBD.
11-14 — Men's golf, European PGA, Qatar Masters, Doha.
11-14 — Women's golf, LPGA, Welch's/Fry's Championship, Tucson, Ariz.
11-14 — Men's golf, PGA Tour, Honda Classic, Palm Beach Gardens, Fla.
11-14 — Snowboarding, World Cup, Bardonecchia, Italy.
11-14 — Diving, FINA Grand Prix, Moscow.
11-21 — Women's tennis, WTA Tour Pacific Life Open, Indian Wells, Calif.
12 — Ski jumping, World Cup, Oslo, Norway.
12-13 — Men's and women's college track, NCAA Division I Indoor championships, Fayetteville, Ark.
12-13 — Men's and women's college track, NCAA Division II Indoor championships, Boston.
12-13 — Men's and women's college track, NCAA Division III Indoor championships, Whitewater, Wis.
12-13 — College wrestling, NCAA Division II championships, Mankato, Minn.
12-14 — Men's golf, PGA Champions, SBC Classic, Valencia, Calif.
12-14 — Speedskating, World Single Distance Championships, Seoul, South Korea.
12-14 — Auto rally, FIA, Mexico Rally.
12-14 — Cross-country skiing, World Cup, Pragelato, Italy.
12-15 — Weightlifting, U.S. Championships, Merrillville, Ind.
13 — Auto racing, NASCAR Trucks, Atlanta 200, Hampton, Ga.
13-14 — Speedskating, Short Track World Team Championships, St. Petersburg, Russia.
14 — Ski jumping, World Cup, Oslo, Norway.
14 — Running, Barcelona (Spain) Marathon.
14 — Auto racing, NASCAR Nextel Cup, Golden Corral 500, Hampton, Ga.
14 — Men's and women's college basketball, NCAA Division I tournament and NIT pairings announced.
14 — Running, Nagoya (Japan) International Women's Marathon.
15-21 — Men's bowling, PBA World Championship, Taylor, Mich.
15-21 — Men's tennis, ATP Pacific Life Open, Indian Wells, Calif.
16 — Men's college basketball, NCAA Division I basketball tournament opening round, Dayton, Ohio.
16-23 — Men's and women's skiing, U.S. Alpine Championships, Alyeska, Alaska.
17-18 — Shooting, U.S. Olympic Trials, Shotgun, Fort Benning, Ga.
17-23 — Women's college basketball, NAIA Division I Championships, Jackson, Tenn.
18 — Men's college basketball, NCAA Division I basketball tournament first round starts, various sites.
18-20 — Women's college swimming and diving, NCAA Division I championships, College Station, Texas.
18-20 — Men's college swimming and diving, NCAA Division III championships, St. Peter's, Mo.
18-20 — College wrestling, NCAA Division I championships, St. Louis, Mo.
18-20 — Table Tennis, U.S. Doubles Olympic Qualifying, Washington.
18-21 — Auto racing, NHRA, Mac Tools Gatornationals, Gainesville, Fla.
18-21 — Men's golf, European PGA, Singapore Masters.
18-21 — Women's golf, LPGA, Safeway International, Superstition, Ariz.
18-21 — Men's golf, PGA Tour, Bay Hill Invitational, Orlando, Fla.
18-21 — Diving, FINA Grand Prix, Madrid, Spain.
18-28 — Sailing, U.S. Olympic Trials, Star event, Miami.
19-21 — Men's golf, PGA Champions, Toshiba Senior Classic, Newport Beach, Calif.
19-21 — Speedskating, World Short Track Championships, Gothenburg, Sweden.
19-28 — Field hockey, women's qualifying tournament for Olympics (Spain, Germany, Britain, Ireland, Japan, South Korea, New Zealand, Ukraine, United States and one more TBC), Auckland, New Zealand.
20 — Auto racing, NASCAR Busch, Darlingtonraceway.com 200, Darlington, S.C.
20 — Women's college basketball, NCAA Division III championship, Norfolk, Va.
20 — Men's college basketball, NCAA Division III championship, Salem, Va.
20 — Women's college basketball, NCAA Division I basketball tournament starts, various sites.
20 — Women's college ice hockey, NCAA Division III championship, TBD.
20 or 21 — Men's college ice hockey, NCAA Division III championship, TBD.
20-21 — Athletics, IAAF women's race-walking challenge, Tijuana, Mexico.
20-21 — Running, IAAF, World Cross Country Championships, Brussels, Belgium.
20-21 — Men's skiing, U.S. Jumping Championships, Steamboat Springs, Colo.
20-21 — Men's skiing, U.S. Nordic Combined Championships, Steamboat Springs, Colo.
20-21 — Archery, U.S. Indoor Nationals, Louisville, Ky.
21 — Running, Marseille (France) Marathon.
21 — Auto racing, IRL, TBA, Phoenix.
21 — Auto racing, Formula One, Malaysian Grand Prix, Kuala Lumpur.
21 — Auto racing, NASCAR Nextel Cup, Carolina Dodge Dealers 400, Darlington, S.C.
22-28 — Figure Skating, World Championships, Dortmund, Germany.
22-April 4 — Tennis, ATP-WTA Tour Nasdaq-100 Open, Miami.
24-30 — Men's college basketball, NAIA Division I Championships, Kansas City, Mo.
24-April 4 — Women's tennis, WTA Tour, NASDAQ-100 Open, Miami.
25 — Olympics, lighting of the Athens Olympic flame and start of torch relay, Ancient Olympia, Greece.
25-27 — Men's college swimming and diving, NCAA Division I championships, East Meadow, N.Y.
25-27 — Synchronized swimming, U.S. Collegiate Championships, Ann Arbor, Mich.
25-28 — Men's golf, PGA Tour, The Players Championship, Ponte Vedra Beach, Fla.
25-28 — Women's golf, LPGA, Kraft Nabisco Championship, Rancho Mirage, Calif.
25-28 — Men's golf, PGA Nationwide Tour, Louisiana Open, Broussard.
25-28 — Men's golf, European PGA, Madeira Island Open, Madeira, Portugal.
25-28 — Men's and women's fencing, NCAA championships, Waltham, Mass.
26 — Women's college ice hockey, NCAA Division I championship semifinals, Providence, R.I.
26-28 — Men's and women's skiing, U.S. Freestyle Championships, Heavenly Valley, Utah.
27 — Auto racing, NASCAR Busch, TBA, Bristol, Tenn.
27 — Men's college basketball, NCAA Division II championship, Bakersfield, Calif.
27 — Women's college basketball, NCAA Division II championship, St. Joseph, Mo.
27 — Horse racing, Dubai World Cup, Dubai, United Arab Emirates.
28 — Rowing, 150th Oxford-Cambridge Boat Race, London.
28 — Running, Rome Marathon.
28 — Women's college ice hockey, NCAA Division I championship game, Providence, R.I.
28 — Auto racing, NASCAR Nextel Cup, Food City 500, Bristol, Tenn.
28 — Motorcycle racing, World Superbike, Phillip Island, Australia.
28-April 1 — Pro football, NFL Annual Meeting, Palm Beach, Fla.
28-April 4 — Women's ice hockey, World Championship, Halifax, Nova Scotia.
29-April 4 — Men's tennis, ATP NASDAQ-100 Open, Miami.