Neither Venus or Serena Williams were good enough to win the US Open singles championship, but together they were good enough to win their 10th Grand Slam doubles championship.

“I have a great partner,” Venus Williams said. “I believe in her just as much as I believe in myself.”

The sisters beat the defending champions Cara Black and Liezel Huber 6-2, 6-2.

“They’re bigger and stronger than us,” Huber said. “They served bigger than us and you could see it all today.”

Surprisingly, Serena lasted the entire match without killing a line judge. Looks like she’s learning to control her temper.