BOSTON (AP) Corey Kluber worked six scoreless innings and the Tampa Bay Rays beat the Red Sox 7-1 on Wednesday night in the major league debut of Brayan Bello, the top pitching prospect in Boston's system.

With a fastball topping out at 97 mph, the 23-year-old Bello (0-1) worked four up-and-down innings, allowing four runs on six hits with three walks and four strikeouts. The right-hander finished his 79-pitch outing by retiring two batters after Josh Lowe's one-out double.

"I grabbed him and said, `Hey, man, you're a big leaguer,'" Red Sox manager Alex Cora said. "He had a big smile. He actually thought he was going to have the fifth, but I thought it was enough, 80-something pitches, first big league start, it was a lot of hard work. We'll see what we do next, but just happy that he was able to get out there and enjoy this. Obviously he's disappointed with the results, but at the end of the day, he's a big leaguer, and we're proud of him."