SCOTTSDALE—Chad Tracy celebrated his addition to the Cubs’ opening-day roster with a two-run homer in the eighth inning, leading the Northsiders over the San Francisco Giants 5-3 Tuesday.Tracy edged out veteran infielder Kevin Millar for the final spot earlier in the day. He homered off Guillermo Mota, making a bid for a short role in the Giants’ bullpen.Former Cub Mark DeRosa gave the Giants a 3-2 lead with a two-run homer in the fourth. The Cubs tied it in the seventh on Mike Fontenot’s single. Tyler Colvin, also a newcomer to the Cubs’ roster, had a pair of hits and raised his spring average to .457.Aaron Rowand continued his productive spring with two doubles and a single and is batting .479 for the Giants.Right-hander Todd Wellemeyer, formerly on the Cubs, moved closer to getting the No. 5 spot in the Giants’ rotation. He gave up three runs on five hits while pitching a spring-high seven innings. He walked one and struck out four.Wellemeyer said he still hasn’t officially been told that he has locked up that spot. He is 3-0 with a 2.00 ERA and will pitch Sunday’s exhibition finale against Seattle.

NOTES—DeRosa showed he is adjusting to playing left field by throwing Marlon Byrd out at the plate in the seventh inning as he tried to score on a single by Fontenot. … Giants RHP Tim Lincecum will make his final start of the spring today against Oakland in a minor league game. … Cubs closer Carlos Marmol pitched 1 1-3 innings and John Grabow came on to get his second save.