After another round of thrilling tennis at the 2013 BMW Open, we are headed to the quarterfinals.
No. 1 seed Janko Tipsarevic is still alive, as are No. 3 seed Tommy Haas and No. 4 seed Philipp Kohlschreiber. Tipsarevic—ranked No. 10 in the world—has struggled with his serving this year, but you would think it's only a matter of time before he breaks through given his history.
Here's a look at the strengths and weaknesses of each remaining top seed in the 2013 BMW Open in terms of what they've done in 2013 (quarterfinals opponents in parentheses).
*All stats via ATPWorldTour.com
4. Philipp Kohlschreiber (vs. Viktor Troicki)
Strengths: Second-Serve Points Won
Philipp Kohlschreiber ranks 38th on the ATP Tour in first-serve points won, but he ranks second in second-serve points won (57 percent).
Against Evgeny Korolev in the Round of 16, Kohlschreiber won 81 percent of his second serves.
Weaknesses: Second-Serve Return Points
When the role reverses, however, the German struggles mightily. Kohlschreiber had won just 45 percent of second-serve return points headed into the BMW Open, good for 73rd on tour.
Kohlschreiber won 50 percent of second-serve return points against Korolev.
3. Tommy Haas (vs. Florian Mayer)
Coming into the BMW Open, Tommy Haas ranked 21st in first-serve points won and third in second-serve points won (by percentage).
Against Ernests Gulbis in the Round of 16, he captured 72 percent of first serves and 57 percent of second serves.
Weaknesses: Break Points Saved/Converted
When it comes to break points, Tommy Haas doesn't generally step up to the challenge. He ranked 75th on tour in break points saved coming into the tournament. He also ranked 61st in break points converted.
On the other hand, Haas was 3-of-4 in break points saved against Gulbis, as well as 4-of-8 in break points won, so perhaps that's a good sign for the 35-year-old at the BMW Open.
1. Janko Tipsarevic (vs. Daniel Brands)
Strengths: Return Game, Break Points Saved
Janko Tipsarevic ranks 37th in return games won this season. He ranks 34th in first-serve return points won and 33rd in second-serve return points won.
Against Grega Zemlja in the Round of 16, he had a rough time with first serves, but he captured 82 percent of second-serve return points.
Tipsarevic has also been solid saving break points this year. He ranks 21st on tour in break points saved and saved 2-of-3 break points against Zemlja.
Tipsarevic ranks 39th in first-serve points won and 51st in second-serve points won this season. He was terrific against Zemlja on first serves (28 of 37), but he converted only 45 percent of his second serves.
On the other hand, Tipsarevic was an excellent server in 2012, so that game figures to come around eventually.