MASON, Ohio — James Blake upset No. 16 seed Jerzy Janowicz 6-1, 7-5 in the first round of the Western & Southern Open on Monday.
The 33-year-old Blake reached the tournament's second round for the second straight year.
Janowicz, ranked 16th, lost in his first appearance at the tournament. He lost to eventual champion Andy Murray in the Wimbledon semifinals.
"He's a really good player," Blake said of Janowicz. "I knew he could be a little up and down. He definitely didn't have his best first set.
"He started out a little slow, and I kind of took advantage, used the momentum, and it came down to taking really good care of my break points. I came up with some good serves and a couple of big forehands, and that was the difference, I think."
Former U.S. Open champion Sam Stosur moved into the second round of the tournament with a 6-1, 7-5 win over Svetlana Kuznetsova.
Stosur, who won the 2011 U.S. Open, lost in the round of 16 at the Rogers Cup in Toronto last week after winning the Southern California Open.
In the first night session match, 37th-ranked Venus Williams lost the first three games before roaring back for a 6-4, 6-1 win over qualifier Jana Cepelova.