CLEMSON -- Clemson eroded some of the gains it made in a rebound week with a 7-6 loss to last-place Maryland on Sunday, just the third loss to the Terps in Doug Kingsmore Stadium history.

While Clemson (18-13, 6-9 ACC) is listed as a No. 3 seed in the NCAA tournament in Baseball America's latest projection, and a No. 2 seed by thanks to a 10th RPI ranking, the last time Clemson finished below .500 in ACC play it missed the NCAA tournament in 2008.

Sunday marked a bad loss and Clemson cannot afford many more down weekends.

Clemson coach Jack Leggett, who declared the campaign to be a 30-game season earlier in the week, wants to see quality play maintained over the course of an entire week, especially in a series against Maryland (15-17, 3-12), which resides in last place in the Atlantic Division.

"We've got to get better," said Leggett, whose Tigers are 55-3 all-time at home against Maryland. "We didn't pitch well. We didn't play well enough to win."

Clemson starter Will Lamb failed to pitch out of the fourth inning, Scott Weismann struggled in relief, and Leggett said starter Kevin Brady (forearm strain) is still weeks away from returning. Brady has begun a throwing program.

Leggett tried to boost Weismann's confidence by starting him Wednesday in a midweek game against Western Carolina. But after picking up the win against Western, Weismann entered in relief of Lamb on Sunday and again struggled against power-conference competition.

Weismann pitched 1 2/3 innings and struggled with his command, walking two, allowing three hits and two runs, allowing Maryland to take a 6-5 lead in the sixth.

Leggett relieved Weismann with a player who has turned his season around -- Alex Frederick.

Frederick saved Weismann from further damage by inducing a double play to end the sixth. After a 1-2-3 seventh, Frederick worked around a leadoff double by Maryland's Tim Kiene in the eighth, striking out two to end the threat.

But Frederick was unable to work around a leadoff double in the ninth as Alfredo Rodriguez doubled and Michael Montville singled to score Rodriguez and give Maryland a 7-6 lead.

Clemson placed runners on first and second with one out for Miller in the ninth. Miller has been red-hot since returning to the lineup, entering his final at bat of the day 17 of his last 24. But Miller struck out swinging and Maryland's Korey Wacker induced Spencer Kieboom to groundout to end the game.

"I was trying to be aggressive," Miller said. "I saw three good pitches I just couldn't do anything with them. … I'd trade a (multi-hit) day for a win.

But Miller feels the team made strides in a 4-1 week.

"We have our killer instinct back," said Miller.

, who recorded his sixth straight game multi-hit game. "Our style of play this week was good."

Follow Travis Sawchik on Twitter@travis_sawchik.