Javier Baez made his major league debut a memorable one for himself and his family.
Baez led off the 12th inning with a towering home run and the Chicago Cubs beat the Colorado Rockies 6-5 on Tuesday night.
Wellington Castillo also homered for the Cubs, who have won four of five.
Baez, a prized prospect called up before the game, played his first game in the big leagues with his family sitting behind home plate. He struck out in three of his first five at-bats before hitting Boone Logan's first pitch of the 12th an estimated 414 feet into the Rockies' bullpen.
''I faced him before and he threw me all curveballs,'' Baez said. ''He's got a good curveball so I wasn't sitting on the curveball, I was trying to hit a fastball.''
When he crossed home plate he pointed to his personal fan club and went back to the dugout where he was greeted with cheers.
''Everybody was going crazy,'' he said.
Baez nearly had his first hit in the seventh when he a drove a ball hard to right field but it was caught to end the inning. He didn't miss when he got a fastball in the 12th.
''He had a few strikeouts but it wasn't for anxiousness,'' Chicago manager Rick Renteria said. ''He didn't seem anxious at all. He got the first pitch he can hit and drove it.''
Hector Rondon (3-3) blew his fourth save but got the win and Carlos Villanueva picked up his second save.
Both teams scored a run in the 11th to extend the game.
Nolan Arenado homered and Logan (2-2) took the loss for the Rockies, who have dropped five straight.
Rockies starter Brett Anderson allowed just one hit through three innings but left after one pitch in the fourth due to back spasms.
''His back locked up and it doesn't look too good now,'' Rockies manager Walt Weiss said.
Franklin Morales came on and threw two scoreless innings before Castillo led off the sixth with his eighth home run of the season to cut Colorado's lead to 3-1.
The shaky Colorado bullpen faltered in the seventh. Three relievers combined to walk six batters in the inning, three of which scored to give the Cubs a 4-3 lead.
The Cubs drew nine walks and only had six hits.
Arenado tied it in the bottom of the seventh with his 10th home run of the season.
The Rockies took a 2-0 lead in the second on Brandon Barnes' two-run double over the bag at third base.
Colorado added another run on a walk and three hits in the fifth inning.