- Serena Williams into US Open quarter-finals
- Ex-Czech star Vaidisova prepares comeback
- New York hands Wozniacki chance to shine
- Pennetta into US Open quarter-finals
- US Open women's quarter-finals head to heads
- Paths to US Open women's quarter-finals
- Federer to make Brisbane return
- Wozniacki sends Sharapova packing as US Open upsets continue
- US Open men's singles last-16 line-up
- Teen Bencic into US Open quarter-finals
- China's Peng into US Open quarter-finals
- US Open day eight - five facts
- Wozniacki sends Sharapova out of US Open, Federer battles through
- Federer shines in New York rain, Ferrer crashes
- Federer into US Open last-16
- Wozniacki sends Sharapova packing at upset-strewn Open
- Play resumes at US Open after two-hour halt
- Early US Open exit steels Sharapova's resolve
- Wozniacki knocks Sharapova out of US Open, Ferrer falls
- Lucic-Baroni cooks up career revival
- Wozniacki shocks Sharapova to reach US Open last eight
- US Open halted by lightning threat
- Wozniacki knocks Sharapova out of US Open
- Marathon match OK, marathon no way - Errani
- Ferrer, doomed to be the man who wasn't there
- Simon sends ailing Ferrer crashing in US Open sweatshop
- Fourth seed Ferrer out of US Open
- Errani outlasts Lucic-Baroni to reach US Open last eight
- Errani into US Open quarter-finals
- Bouchard passes third-round test
Del Potro refuses to play Davis Cup
Former US Open champion Juan Martin del Potro announced Monday he would not be playing Davis Cup tennis for Argentina this year amid an ongoing dispute with his country's federation.
"I will not be playing in the rest of the 2014 Davis Cup season," the 25-year-old said in a statement.
"In November, I published a letter in which I expressed my disagreement with the hypocrisy surrounding the Davis Cup. Since then, nothing has changed. It has even got worse," added Del Potro, currently world number 5.
Argentina have struggled in the absence of their best player, losing in the first round to Italy and facing a play-off in September to maintain their place in the elite world group.
Del Potro has not represented his country in the Davis Cup since a losing semi-final against the Czech Republic in 2012.
He complains that the Argentinian federation does not show him sufficient respect and fails to take into account his court surface preferences.