Ivo Karlovic, the towering Croatian known for his booming serve, has officially announced his retirement from tennis more than two years after playing his last tournament match. The 2.11-meter (6 foot ...

Karlovic, No. 35 in the world, took the first set in a tidy 37 minutes as on-court temperatures climbed to 136 degrees. He broke Johnson again in the third game of the second set.