Jarkko took a solid 6-4 6-4 win.
Beating Rainer doesn't tell too much about Jarkko's form, but the next match against another familiar German probably will. Jarkko and Philipp played 5 times last year, with Jarkko winning 4 of them but Kohlschreiber taking the last one.
Kohli is a tough player, and I bet the good wins at Indian Wells, Barcelona, Halle and Wimbledon boosted Jarkko's confidence a lot last spring. It woud be very important for Jarkko now to show himself that he's still the better player.