MILWAUKEE (AP) – Neil Walker hit a three-run homer, Charlie Morton pitched seven strong innings and the Pittsburgh Pirates beat Milwaukee 5-2 Monday to retake the NL Central lead.  The Pirates moved one game of St. Louis, which lost earlier in the day at Cincinnati.  Walker broke it open with his homer in the seventh that made it 5-1. Jose Tabata added three hits, including a pair of run-scoring singles.  Morton gave up seven hits and one earned run. He walked two and struck out six while winning his fourth straight decision.  Mark Melancon pitched the ninth for his 10th save in 12 chances.  Tyler Thornburg allowed two runs and six hits in six innings.