BOSTON (AP) — Anthony Rizzo scored the tiebreaking run in the ninth, then endured some uncertain moments in the bottom of the inning before he could celebrate.
He and his Cubs teammates lingered on the field until a replay review confirmed the on-field decision: Rizzo had caught Luis Valbuena's throw from third base to first on a grounder in time to get Dustin Pedroia for the final out.
"It was nerve-wracking," Rizzo said after Chicago's 2-1 win over the Boston Red Sox on Tuesday night, "especially with Big Papi coming up."
Had the call been overturned, David Ortiz would have batted with runners at first and second and two outs.
"I didn't even see the replay," said Pedroia, who gestured in frustration after crossing the bag. "I feel like I was right there. It was bang-bang. I don't know."
Rizzo started the ninth with a single, went to third on a double by Starlin Castro and scored on Valbuena's sacrifice fly off Koji Uehara (3-2). Mookie Betts made the catch in medium right field, but his throw was off line and Rizzo scored easily.
"Oh, gosh, what a great at-bat," Cubs manager Rick Renteria said. "He fell behind (and) was just still able to put enough of the barrel on the baseball to get it deep enough to score the run."
The double was the 37th extra-base hit for Castro, who entered the game tied with Troy Tulowitzki of the Colorado Rockies for the major league lead among shortstops with 36.
Pedro Strop (1-3) pitched a perfect eighth and Hector Rondon worked the ninth for his 11th save in 13 chances.
Boston continued to struggle offensively one night after getting no hits against Jake Arrieta for 7 2-3 innings until Stephen Drew singled. The Red Sox ended that game with season lows of two hits and three base runners in a 2-0 loss. In their last five games, they've scored more than two runs just once.