Roger Federer and Caroline Wozniacki marched on through a day of wild weather and upsets.
No.4 seed David Ferrer knocked out after 6-3, 3-6, 6-1, 6-3 loss to Gilles Simon in the third round.
The shock of the day was delivered by the little-known Krunic, who stung the unsteady Kvitova 6-4 6-4.
The women's draw of the final Grand Slam of the year is thrown wide open after seeded players are ousted.
Lucic-Baroni dismissed second seed Halep 7-6, 6-2 while Bencic ousted Kerber 6-1, 7-5, Federer won 6-4 6-4 6-4.
17-time Grand Slam winner struggles with serve but still prevails over Vania King 6-1, 6-0.
15-year-old Bellis could not deliver the fairytale American tennis fans had hoped for.
Ivanovic and Radwanska, the former No.1 and No.2 respectively, crash out in the second round to unfancied rivals.
Bellis, 15, beats 12th seed Cibulkova, becomes youngest to win a match at US Open since Kournikova in 1996.
Maria Sharapova averted an early exit while China's Peng Shuai upsetted fourth-seeded Agnieszka Radwanska.
American wild card Bellis took her place alongside five-times US champions by stunning 12th seeded Cibulkova.
Ivanovic beat Alison Riske 6-3, 6-0 in first round while 2004 champ Kuznetsova lost 3-6, 6-2, 7-6 to Erakovic.
Roger Federer made $56.2 million (42.6 million euros) from July of last year through this past June.
Andy Murray stretches and strains in first round win over Robin Haase; easy outings for Djokovic, Sharapova.
A steamy first day at US Open proved more than a little stressful for several favourites on Monday.
Ivan Lendl had steadfastly declined to elaborate on the break-up with Andy Murray.
Second seed drops opening set to wildcard Collins but recovers to move into Rd. 2.
In the men’s doubles event, India will be represented by Leander Paes and Davis Cupper Rohan Bopanna.
Greenhorn Townsend is hurdle number one for Serena, who is in line for US Open hattrick.
But one sporting peak no Canadian has yet to reach is the top of the tennis mountain as a grand slam winner.
wMurray said, players will seek out partners whose styles resemble those of scheduled opponents.
The Serb could meet either Andy Murray or Jo-Wilfried Tsonga in the quarter-finals.
World no. 2 Rafael Nadal has withdrawn from the tournament because an injured right wrist.
Roger Federer and Serena Williams, both winners of 17 Slams, lift Cincinnati Masters a week before US Open
Nadal is 44-8 with four titles in 2014, including his record ninth French Open trophy.
A wrist injury forced Nadal to skip the tournament; he also missed Rogers Cup and Cincinnati Open.
Applebee's is a restaurant that has served as an anchor of player life since it opened in 1997.
Serena finished last U.S. Open tune-up by beating Ana Ivanovic 6-4 6-1 to win her first title at Cincinnati.
Serena beat Wozniacki 2-6, 6-2, 6-4, and second-seeded Federer turned back fifth-seeded Raonic 6-2, 6-3.
The second-seeded Federer defeated Murray 6-3, 7-5 after the Scot had taken a 4-1 lead in the second set.
Djokovic’s form after marriage-break continues to slide with his second early exit.
Neither player was able to capitalize on early break chances before Federer eventually won the first set tiebreak.
In a tight contest that did not feature a single break, Williams needed nearly two hours to advance to the last 16.
Third-ranked Federer appeared sluggish at times as he struggled to tame the 46th-ranked Canadian.
Jo-Wilfried Tsonga followed his week of big upsets with an early exit Tuesday.
Jo-Wilfried Tsonga lost to Mikhail Youzhny in his opener two days after winning the Rogers Cup in Toronto.