Mike Fiers was the only option Milwaukee Brewers manager Ron Roenicke had in his bullpen as the game reached the 12th inning Tuesday night. In came Fiers to face Andrew McCutchen, leading off the top of the 12th. Shortly thereafter, McCutchen was rounding third, his teammates gathered at the plate, after his walk-off home run gave the Pirates a 4-3 win Tuesday night at PNC Park. McCutchen entered the game 4 for 8 with two home runs against Fiers in his career. He hit Fiers' 2-2 fastball out to right-center field for his fifth home run this season. McCutchen was flying around the bases and nearing second when the ball cleared the wall, unsure of whether he hit it hard enough after flying out to the warning track earlier. "I hit the crap out of the ball, and they went nowhere [earlier]," he said. "Right off my bat, I didn't know." He accepted his fate during the postgame television interview, opening his arms wide and inviting the inevitable pie in the face from A.J. Burnett. The win came on a night when the Pirates went 0 for 15 with runners in scoring position and stranded 11 men on base. Vin Mazzaro (2-0) earned the win with two scoreless innings of relief. Fiers (0-2) took the loss. The Pirates had a runner in scoring position in the 10th. Pedro Alvarez reached on a fielder's choice and took second on a wild pitch, but was stranded there. Trailing, 3-2, in the eighth, the Pirates tied the score against John Axford. Neil Walker flared a single to left. Alvarez struck out, but Russell Martin doubled down the left-field line. "It felt great," Martin said. "It gave us an opportunity to win the game. Every other night, it seems like somebody's coming through with a big hit late in the game to come back. There's a lot of fight in this team. We never feel like we're out of a game." Third-base coach Rick Sofield, filling in for Nick Leyva, sent Walker. A good throw probably would have caught him at the plate, but Jean Segura's relay throw sailed high of catcher Martin Maldonado and Walker was safe. "He pretty much had to send me there in that situation in the game," Walker said. "I took a peek in the left-field corner about three quarters of the way to third and I said, 'This is going to be really close. I know this is going to be bang-bang.' "