WASHINGTON — Hometown favorite Lamont Peterson won split-decision over champion Amir Khan to capture the WBA and IBF junior welterweight titles Saturday night. Peterson's win was helped by referee Joe Cooper, who took two points away from Khan for pushing in the seventh and 12th rounds. Peterson received scores of 113-112 on two cards. The other had Khan winning 115-110. Peterson improved to 30-1-1. Khan is 26-2.