New York - With her 32nd birthday coming on September 9, Andrea Petkovic started pondering how much longer her 14-year tennis career might last, then showed she has plenty of time remaining.
The 88th-ranked German upset two-time Wimbledon champion Petra Kvitova 6-4, 6-4 Thursday to reach the third round of the US Open, matching her deepest run at Flushing Meadows since a 2011 quarter-final.
"I'm really glad with my mental fortitude," Petkovic said. "It feels like a big win, not because it's Petra but because of the last few weeks and how I reacted to that.
"Every tough moment in matches I view it as a challenge. I don't fall into self-doubt as I have before."
By ousting the Czech sixth seed, Petkovic booked a third-round date with Belgian 25th seed Elise Mertens.
Not bad for a player who says she's in the "fall" of her career.
"You don't know how much longer your career is going to last so I'm really proud of how I've dealt with that," Petkovic said.
"I've really been able to put the results aside and just try to become better and better in each moment."
Petkovic, whose best Slam showing was a 2014 French Open semi-final run, reached a career-high ninth in the rankings in 2011 but knee, ankle and back injuries the next year brought an emotional letdown until she decided to continue her career.
"I chose to keep on playing. That makes everything easier," she said. "Since then I've been able to do what I want to do and still play tennis.
"I'm proud of being part of this with the best women athletes in the world. Sometimes I think we paint ourselves a little smaller."
And despite deeper Slam runs in younger days, Petkovic says her best tennis might be what she shows now.
Petkovic improved to 6-5 against Kvitova, whom she beat in last year's Australian Open.
"I've beaten her before in Grand Slams and big matches. That gave me the belief. That's the most important part if you want to win," Petkovic said.
"It's kind of her own fault. I admire and respect her so much. You're 100 percent focused. You don't let anything stop you. I accept every winner she hits. I stay with it every point."
Petkovic showed her abdomen in her post-win celebration, making good a threat to mock her trainer if he kept staring at his abs in a mirror, and called out friends who cheered her to victory.
"The strange people in the corner, those are my friends. It makes it so special I could win in front of them," she said, adding later, "I think they are already at the bar. I'm not sure I want to see them right now."
US Open results on Thursday (x denotes seeding):
Denis Kudla (USA) bt Dusan Lajovic (SRB x27) 7-5, 7-5, 0-6, 6-3
Stanislas Wawrinka (SUI x23) bt Jeremy Chardy (FRA) 6-4, 6-3, 6-7 (3/7), 6-3
Paolo Lorenzi (ITA) bt Miomir Kecmanovic (SRB) 7-6 (13/11), 6-7 (2/7), 7-6 (7/2), 3-6, 6-3
Nikoloz Basilashvili (GEO x17) bt Jenson Brooksby (USA) 3-6, 7-6 (7/3), 7-5, 6-2
Feliciano Lopez (ESP) bt Yoshihito Nishioka (JPN) 6-7 (7/9), 6-0, 6-4, 6-4
Daniil Medvedev (RUS x5) bt Hugo Dellien (BOL) 6-3, 7-5, 5-7, 6-3
Daniel Evans (GBR) bt Lucas Pouille (FRA x25) 6-4, 6-3, 6-7 (4/7), 6-4
Pablo Carreno-Busta (ESP) bt Ricardas Berankis (LTU) 6-4, 6-7 (3/7), 6-2, 6-0
David Goffin (BEL x15) bt Gregoire Barrere (FRA) 6-2, 6-2, 6-2
Kamil Majchrzak (POL) bt Pablo Cuevas (URU) 6-7 (3/7), 6-4, 2-6, 6-4, 6-1
Alex De Minaur (AUS) bt Christian Garin (CHI x31) 6-3, 7-5, 6-3
Andrey Rublev (RUS) bt Gilles Simon (FRA) 6-2, retired
Nick Kyrgios (AUS x28) bt Antoine Hoang (FRA) 6-4, 6-2, 6-4
Matteo Berrettini (ITA x24) bt Jordan Thompson (AUS) 7-5, 7-6 (7/5), 4-6, 6-1
Alexei Popyrin (AUS) bt Mikhail Kukushkin (KAZ) 2-6, 7-5, 6-3, 6-2
Gael Monfils (FRA x13) bt Marius Copil (ROU) 6-3, 6-2, 6-2
Denis Shapovalov (CAN) bt Henri Laaksonen (SUI) 6-4, 7-6 (7/2), 6-2
Pablo Andujar (ESP) bt Lorenzo Sonego (ITA) 6-2, 6-4, 6-2
Alexander Bublik (KAZ) bt Thomas Fabbiano (ITA) 6-7 (3/7), 5-7, 6-4, 6-3, 6-3
Alexander Zverev (GER x6) bt Frances Tiafoe (USA) 6-3, 3-6, 6-2, 2-6, 6-3
Aljaz Bedene (SLO) bt Benoit Paire (FRA x29) 4-6, 6-7 (3/7), 6-2, 7-5, 7-6 (7/4)
Diego Schwartzman (ARG x20) bt Egor Gerasimov (BLR) 6-4, 6-2, 6-0
Tennys Sandgren (USA) bt Vasek Pospisil (CAN) 6-3, 6-7 (4/7), 6-3, 6-4
John Isner (USA x14) bt Jan-Lennard Struff (GER) 6-3, 7-6 (7/4), 7-6 (7/5)
Marin Cilic (CRO x22) bt Cedrik-Marcel Stebe (GER) 4-6, 6-3, 7-5, 6-3
Chung Hyeon (KOR) bt Fernando Verdasco (ESP x32) 1-6, 2-6, 7-5, 6-3, 7-6 (7/3)
Rafael Nadal (ESP x2) bt Thanasi Kokkinakis (AUS) walkover
Naomi Osaka (JPN x1) bt Magda Linette (POL) 6-2, 6-4
Coco Gauff (USA) bt Timea Babos (HUN) 6-2, 4-6, 6-4
Anett Kontaveit (EST x21) bt Ajla Tomljanovic (AUS) 4-6, 7-5, 6-2
Belinda Bencic (SUI x13) bt Alize Cornet (FRA) 6-4, 1-6, 6-2
Yulia Putintseva (KAZ) bt Aryna Sabalenka (BLR x9) 6-3, 7-6 (7/3)
Donna Vekic (CRO x23) bt Kaia Kanepi (EST) 7-5, 6-3
Julia Goerges (GER x26) bt Francesca Di Lorenzo (USA) 7-5, 6-0
Kiki Bertens (NED x7) bt Anastasia Pavlyuchenkova (RUS) 7-5, 6-4
Taylor Townsend (USA) bt Simona Halep (ROU x4) 2-6, 6-3, 7-6 (7/4)
Sorana Cirstea (ROU) bt Aliona Bolsova (ESP) 3-6, 6-4, 6-2
Caroline Wozniacki (DEN x19) bt Danielle Collins (USA) 4-6, 6-3, 6-4
Bianca Andreescu (CAN x15) bt Kirsten Flipkens (BEL) 6-3, 7-5
Kristie Ahn (USA) bt Anna Kalinskaya (RUS) 6-2, 6-3
Jelena Ostapenko (LAT) bt Alison Riske (USA) 6-4, 6-3
Elise Mertens (BEL x25) bt Kristyna Pliskova (CZE) 6-2, 6-2
Andrea Petkovic (GER) bt Petra Kvitova (CZE x6) 6-4, 6-4
Dayana Yastremska (UKR x32) bt Rebecca Peterson (SWE) 6-4, 6-1
Sofia Kenin (USA x20) bt Laura Siegemund (GER) 7-6 (7/4), 6-0
Johanna Konta (GBR x16) bt Margarita Gasparyan (RUS) 6-1, 6-0
Zhang Shuai (CHN x33) bt Ekaterina Alexandrova (RUS) 7-6 (7/5), 4-6, 6-3
Ons Jabeur (TUN) bt Aliaksandra Sasnovich (BLR) 3-6, 6-4, 6-2
Karolina Muchova (CZE) bt Hsieh Su-Wei (TPE x29) 6-1, 4-6, 7-6 (7/2)
Petra Martic (CRO x22) bt Ana Bogdan (ROU) 6-2, 6-4
Anastasija Sevastova (LAT x12) bt Iga Swiatek (POL) 3-6, 6-1, 6-3
Fiona Ferro (FRA) bt Kristina Mladenovic (FRA) 6-4, 6-7 (3/7), 6-3
Wang Qiang (CHN x18) bt Alison Van Uytvanck (BEL) 7-5, 6-4
Maria Sakkari (GRE x30) bt Peng Shuai (CHN) 6-7 (5/7), 6-4, 6-2