Kalamazoo Champion Tien Falls to Kecmanovic in US Open Debut; Eubanks Posts First Slam Win; Rowinska Upsets Top Seed Daubnerova at ITF J1 Repentigny

Kalamazoo 18s champion Learner Tien made some new fans Tuesday after the 16-year-old left-hander from California extended No. 32 seed Miomir Kecmanovic of Serbia to four sets in the first round of the US Open.

Tien played a flawless first set, hitting 10 winners and just three unforced errors as he took the first set from Kecmanovic 6-3. Tien was in no way overpowered in the next three sets, with Kecmanovic winning them 6-1, 6-3, 6-3, but he did find himself pushed back to well behind the baseline. Kecmanovic didn't give any ground himself, served better and cleaned up his unforced errors and he was not broken after that final game of the first set.

Tien had never played anyone inside the ATP Top 300 before, with his first Pro Circuit tournament in April of this year, so even a loss can be encouraging under those circumstances.

Christopher Eubanks has been searching for his first slam win since receiving a wild card into the US Open in 2017, the year he left Georgia Tech after his junior year to pursue a pro career. He has since qualified four times into the main draw, twice in Australia and twice at the US Open, including this year.  Today he got that elusive first win, defeating Pedro Martinez of Spain 7-5, 6-3, 7-6(3). His second round opponent will be No. 11 seed Jannik Sinner of Italy.

Doubles begins on Wednesday, with men's, women's and mixed matches on the schedule. The mixed doubles draw features eight wild card teams, and while no juniors received a mixed wild card, the two American NCAA champions--Jaeda Daniel of North Carolina State and Richard Ciamarra of Texas--were awarded one.

The USTA 18s National champions Reese Brantmeier and Clervie Ngounoue are on Wednesday's schedule, playing Rosalie Van Der Hoek of the Netherlands and Alison Van Uytvanck of Belgium.

Below are the results from today, and the second round matches for Wednesday. Three matches are still in progress, including that of NCAA champion Peyton Stearns, who is down a break 4-3 in the third set.

Tuesday's first round singles results of Americans:

Alison Van Uytvanck(BEL) d. Venus Williams[WC] 6-1, 7-6(5)
Danielle Collins[19] d. Naomi Osaka(JPN) 7-6(5), 6-3
Jessica Pegula[8] d. Viktorija Golubic(SUI) 6-2, 6-2
Yulia Putintseva(KAZ) d. Amanda Anisimova[24] 6-3, 6-3
Victoria Azarenka[26](BLR) d. Ashlyn Krueger[Q] 6-1, 4-6, 6-2
Ekaterina Alexandrova[28](RUS) d. Peyton Stearns[WC] 
Sloane Stephens d. Greet Minnen(BEL) 1-6, 6-3, 6-3
Aryna Sabalenka[6](BLR) d. Catherine Harrison[Q] 6-1, 6-3
Lauren Davis d. Lucia Bronzetti(ITA) 4-6, 7-6(3), 5-4 ret.
Anhelina Kalinina(UKR) d. Bernarda Pera 6-4, 6-4
Katerina Siniakova(CZE) d. Taylor Townsend 6-4, 4-6, 6-2

Anastasia Potapova(RUS) d. Claire Liu 6-1, 6-4
Jule Niemeier(GER) d. Sofia Kenin[WC] 7-6(3), 6-4

John Isner d. Federico Delbonis[Q](ARG) 6-3, 6-1, 7-5

Joao Sousa(POR) d. Mackenzie McDonald 1-6, 7-6(4), 7-6(4), 6-3

Ilya Ivashka (BLR) d. Sam Querrey[WC] 4-6, 6-4, 7-6(8), 6-3

Diego Schwartzman[14](ARG) d. Jack Sock 3-6, 5-7, 6-0, 1-0 re.

Jenson Brooksby d. Dusan Lajovic(SRB) 6-2, 6-0, 3-0 ret.

Miomir Kecmanovic[32](SRB) d. Learner Tien[WC] 3-6, 6-1, 6-3, 6-3

Christopher Eubanks[Q] d Pedro Martinez(ESP) 7-5, 6-3, 7-6(3)

Brandon Nakashima d. Pavel Kotov[Q] 7-6(4), 6-2, 6-2

Grigor Dimitrov[17](BUL) d. Steve Johnson 6-3, 6-2, 6-2 

Frances Tiafoe[22] d. Marcos Giron 7-6(0), 6-4, 6-3

Wednesday second round matches featuring Americans:

Tommy Paul[29] v Sebastian Korda
Brandon Holt[Q] v Pedro Cachin(ARG)
Emilio Nava[WC] v Andy Murray(GBR)
JJ Wolf[WC] v Alejandro Tabilo(CHI)

Madison Keys[20] v Camila Giorgi(ITA)
Coco Gauff[12] v Elena Gabriela Ruse(ROU)
Alison Riske-Amritraj[29] v Maria Camila Osorio Serrano(COL)
Elli Mandlik[WC] v Ons Jabeur[5](TUN)
Shelby Rogers[31] v Viktoria Kuzmova(SVK)
Serena Williams v Anett Kontaveit[2](EST)

The ITF J1 in Repentigny Canada has yet to conclude its second round, but there have already been several notable upsets.

Top seed Nikola Daubnerova of Slovakia lost in her first match of the tournament (it's a 48 draw, with the seeds getting byes in the first round), to Malwina Rowinska of Poland, 3-6, 6-1, 6-3. Daubnerova is No. 8 in the current ITF Junior rankings, with Rowinska No. 92.  Tatum Evans of the US defeated No. 16 seed Renata Jamrichova of Slovakia 5-7, 6-0, 6-3 to reach the third round.

Duncan Chan of Canada, who won the College Park doubles title Saturday, defeated No. 4 seed Arthur Gea of France 6-3, 6-4 and will play unseeded Adhithya Ganesan of the US, who beat No. 13 seed Constantinos Koshis of Cyprus 6-2, 7-6(5). 

Quang Duong defeated No. 10 seed Connor Henry Van Schalkwyk of Namibia 7-6(3), 6-3 and Kurt Miller beat No. 15 seed Sebastian Eriksson of Sweden 5-7, 6-4, 7-5.