PITTSBURGH — James Loney's line-drive single scored the go-ahead run in the 12th inning after Pittsburgh reliever Craig Hansen walked the bases full, and the Los Angeles Dodgers inched closer to winning the NL West by holding off the Pirates 4-3 Thursday.

The Dodgers left 12 on base despite getting only six hits and withstood two Pittsburgh comebacks for their 15th victory in 18 games. They own a 3½- game lead over Arizona, which beat San Francisco 3-2. The Dodgers' magic number for winning the division is seven, in any combination of Los Angeles wins and Arizona losses.

Los Angeles hadn't scored since the seventh until Hansen (1-4) — the seventh of eight Pittsburgh pitchers — walked Russell Martin, Manny Ramirez intentionally and Casey Blake. Loney, a left-handed batter, then drove a single into left off T.J. Beam.

Scott Proctor (2-0) won it with a scoreless 11th inning and Jonathan Broxton finished for his 14th save in 16 opportunities, stranding the potential tying run at third.

Paul Maholm, the Pirates' most reliable starter, allowed only three hits over seven innings but was hurt by wildness, walking six. All but one Dodgers run was scored by a runner who walked.