Denmark's Caroline Wozniacki beat the heat and Maria Sharapova 6-4, 2-6 and 6-2 to move into the quarter-finals of the U.S. Open.
After Wozniacki took the opening set and Sharapova leveled the match officials declared the heat rule in effect, both players leaving the sizzling stadium as soaring temperatures and stifling humidity made conditions too dangerous to play.
Action resumed 12 minutes later but not before Sharapova was warned for not returning to the court on time.
A stormy day finished off with another upset on Arthur Ashe stadium court as 17-year-old Swiss sensation Belinda Bencic swept past ninth-seeded Serb and former world number one Jelena Jankovic 7-6 and 6-3.
Bencic, who is coached by Martina Hingis's mother Melanie Molitor, will face china's Peng Shuai in the last eight.
On the men's side, Roger Federer came back with renewed vigor after a weather delay to beat Spaniard Marcel Granollers 4-6, 6-1, 6-1 and 6-1.
Granollers surprisingly led the second-seeded Swiss 5-2 when lightning and heavy rains suspended their afternoon match.
After play resumed a couple of hours later, 17-times grand slam winner Federer conceded the first set and trailed 1-0 in the second before taking 18 of the next 20 games to secure victory.
France's Gilles Simon, the 26th seed, defeated Spanish fourth seed David Ferrer, who became the first top 10 men's seed to be shown the exit when he fell 6-3, 3-6, 6-1 and 6-3.
Bulgarian seventh seed Grigor Dimitrov recovered from a sleepy start to dump Belgian David Goffin 0-6, 6-3, 6-4 and 6-1.
Rising talent Dominic Thiem continued to surprise, following up his second round win over 11th seed Ernests Gulbis by dismantling 19th seed Feliciano Lopez of Spain 6-4, 6-2 and 6-3.
Ajax Amsterdam suffered their second defeat in as many weeks as they lost 2-0 away to Groningen in the Dutch Eredivisie.
The Dutch champions had the best chance of the first half when Groningen defender gave the ball to Norwegian striker Kolbeinn Sigthorsson who laid it off to Anwar el ghazi in the penalty area; however his first-time effort went well over the crossbar.
Groningen broke the deadlock soon after the break when Nick Van Der Velden's pass found Tjaronn Chery and his pass across the penalty area was tapped in from close range by Brazilian defender Eric Botteghin in the 48th minute.
Van Der Velden and Chery linked up for the second goal as the latter crossed the ball into the penalty area where substitute Michael de Leeuw headed the ball into the net unchallenged, much to the delight of his coach, Erwin Van Looi.
Groningen moved up to second place in the table on nine points, three behind leaders PSV Eindhoven. Ajax remain moved down to seventh place with six points.