The final was rained out on Sunday, with former two-time Munich champion Kohlschreiber leading 3-2 on serve.
Murray was in his first final on clay and won his 32nd career title, a welcome boost ahead of the
The top-ranked Williams broke Stephens four times and saved both break points she faced to secure her 25th straight win. Williams remained undefeated in 2015, with her last loss coming in round-robin play at last year's WTA finals.
Caroline Wozniacki powered past
In the men's competition,