Veteran Doug Tewell made a "confusing" hole-in-one en route to an opening-round 68 yesterday to be within striking distance of the Kemper Open leaders.

Tewell was without his regular tour caddie, so he and a temporary Kemper caddie named Leonard ("I don't know his last name," Tewell said) debated between an 8-iron and a 7-iron as the club to hit on the little creek-guarded 160-yard 11th hole. "That was probably the most confusing shot I hit all day," said Tewell, 40, a 16th-year player from Edmond, Okla. "It took two or three minutes to get the shot off; that's unusual for me. I usually take 30 seconds and go. I finally said, 'I'll hit a smooth 7-iron and get it back to the hole.' "

The ball found the cup for Tewell's seventh career ace. Tewell said Leonard then cracked, "We gotta get more confused out here."

"I'm currently coming out of a slump," said Tewell, who won for the fourth time in 1987 and hasn't won since. "This year has not been kind to me. But now's not the time to go home. The money is going up." Funk at Par

Fred Funk, the second-year PGA Tour pro from Laurel, made a 20-foot birdie putt on his final hole to finish at par 71, but was not pleased with his putter. After missing an eight-foot birdie attempt at the 17th hole, an angry Funk threw his ball into a convenient lake. "I really only made two putts all day," said Funk, 33, who has made about $70,000 in the last month and almost $82,000 this season. "I should have been under par. I hit the ball better than a 71. I love being here. I love playing in front of all the guys, but I need to get the putter going."

Funk took a double-bogey 7 on the par-5 13th. He said the wind changed directions when his wedge approach shot was in the air, and the ball plunged into a creek. He rolled up his trousers, waded into the muck and splashed his his fourth shot 30 feet from the hole. Still he three-putted for 7. "That fact that I missed putts doesn't bother me," Funk said. "It's just when they're not even close . . ."

Former Frederick pro Donnie Hammond closed with a birdie at the 17th and a scrambling par at his final hole to finish with 70.

Hammond hit a 6-iron onto the green at the par-3 17th hole and sank a 25-foot putt for birdie to go one under par. On the long par-4 18th, he drove his tee shot into fairway sand and hooked his second shot to the left of the green and found more sand in a greenside bunker. He blasted to within three feet of the hole and sank that putt for par.

"It always better to make birdie and make a good up and down. It makes lunch a lot better," said Hammond.

At the tail end of last year, Hammond hit paydirt. He won his second tour event, the Texas Open, was second at the Disney tournament, was fifth in the rich Nabisco tournament and was fourth at Kapalua in Hawaii. That stretch was worth $350,000 and during that roll, as well as yesterday, Hammond was steadily drinking a mineral drink that keeps blood sugar constant and prevents cramps.

He started a business selling the drink (similar to Gatorade) after buying franchise rights from a West German company. "I'm like the Remington man. I liked it so much we bought the company," said eight-year pro Hammond, who lives near Orlando, Fla. Peddicord Rebounds

Maryland Open champion Chris Peddicord, awakened after hooking into water for a double bogey on the fourth hole, eagled the sixth and finished at 71. Peddicord, from Baltimore, said the double bogey "made me stand up and start playing golf. It changed my attitude. I started playing more aggressively."

Two holes later, he hit a 3-iron second shot onto the green at the par-5 sixth hole and made a 15 foot putt for eagle 3. . . .

Bob Boyd, University of Maryland graduate and new head pro at Woodmont in Rockville, offset three straight bogeys on the front nine with two birdies on the back nine and finished at 71.

Boyd was in perfect position, 57 yards from the green in two shots on No. 6, but hit a sand wedge far over the green and took his second straight bogey. . . .

A triple bogey and creek problems on his opening hole (the par-4 10th) put Bethesda PGA Tour pro Webb Heintzelman in the hole early. He birdied his final two holes of the day, the eighth and ninth, and salvaged a 76. He will have to come up with a good number today to make the 36-hole cut. . . .

John McNaney of Columbia, Md., one of the hottest players on the Middle Atlantic PGA circuit, also matched par with 71.