The senior will be a game-time decision Thursday against IL. Watkins leads in rebounds with 9.5 while Carr tops in assists with 4.8 per game.
After Watkins' exit, however, Isaac Haas was limited in the post as several Penn State (19-10, 9-7) reserve big men succeeded in denying him the ball without much help from their teammates.
MSU outshot the Nittany Lions, 30-28. The team disclosed the injury in a statement before tipoff.
The senior guard sank 5 of his last 7 shots and finished with 18 points.
There was a scary moment late in the half when Haas got pulled down hard going for a rebound and was very slow to get up.
"I think it was just a great win in terms of from an energy standpoint", Purdue coach Matt Painter said. The team's most versatile weapon and best rebounder was relegated to cheerleader, with a walking boot on his injured wheel for Sunday night's game against surging Penn State. Watkins grabbed the rebound and was fouled. Shep Garner scored 19 with a 5-for-8 3-point shooting effort.
The Nittany Lions committed 15 turnovers and forced Purdue to just nine. Penn State added a Tyler Davis field goal and a safety to complete the 33-14 victory.
With just over a minute left, Dakota Mathias came off a curl screen and hit a 3-pointer from the wing to give Purdue a four-point lead.
USA must find a middle ground on gun reforms
However, Montana is in the process of unraveling its mental health safety net to balance the state budget revenue shortfall. Consistent reporting of people who shouldn't have guns to the national background check database.
Penn State's defense made the first big play when Grant Haley had an interception on Pitt's fourth play of the game. Old rival Pitt was in town, and the Nittany Lions were looking to avenge a loss to the Panthers from the previous season. Lewandowski scored the second and third MSU goals - both set up by Khodorenko and Hirose, while Hirose added an empty-netter to seal the win in the closing minutes.
Carsen Edwards: With forward Vincent Edwards out with an ankle sprain, the Boilermakers had to replace his 14.9 points per game.
Missed FT: Sunday wasn't Mike Watkins' night. He scored 10 points in the final four minutes of the first half, but still the Boilers went into the locker room trailing, 36-32.
The Boilermakers were without leading rebounder and second-leading scorer Vincent Edwards.
The two teams will complete the two games series on Saturday at 5 p.m.at Munn. Eifert started in his place.
His foul situation could've been fatal to Penn State's upset chances and wasn't (see below) - but his missed free throw with 4.9 seconds left was a backbreaker. This will also be the first Big Ten match for the Buckeyes. Purdue's senior class is now 6-0 against Penn State. The loss ended a stretch of six wins in seven games.
Carr now leads the Big Ten in scoring as the Philadelphia, Pa., native, is averaging 19.6 points per game.