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Already out of the top 50 in the rankings, Grigor Dimitrov's struggles continued with a surprise loss at the Atlanta Open.

Dimitrov's struggles continue in Atlanta, Sock beaten on return

Grigor Dimitrov's tough year continued with a first-round loss at the Atlanta Open, while Jack Sock's return ended in defeat on Tuesday.

Dimitrov has struggled throughout 2019 and the former world number three went down to qualifier Kevin King 7-5 6-4 at the ATP 250 event.

The Bulgarian now holds an 11-12 win-loss record this year, a run that has seen him drop to 53rd in the world.

Sock, making his first appearance since January after being sidelined due to a thumb injury, was edged by Miomir Kecmanovic 7-6 (11-9) 7-6 (7-5).

Miomir Kecmanovic gets past Jack Sock 7-6(9), 7-6(5). #AtlantaOpen #USOpenSeries pic.twitter.com/RnB7GrnyVL
— BB&T Atlanta Open (@BBTatlantaopen) July 24, 2019

There were three seeds in action, with Frances Tiafoe suffering a surprise 4-6 6-3 7-6 (7-4) loss to Bernard Tomic.

Radu Albot, however, avoided an upset defeat, getting past Tennys Sandgren 6-4 7-6 (7-4), and Ugo Humbert was too good for Cole Gromley 7-6 (7-2) 6-2.

Reilly Opelka sent down 17 aces in a 6-3 7-6 (7-1) victory over Alexander Bublik and Daniel Evans thrashed Jason Jung 6-1 6-1 inside an hour.

We’ve got another winner — @NewYorkOpen champ @ReillyOpelka needs two sets to dismiss Alexander Bublik 6-3, 7-6(1) pic.twitter.com/L98w412wCa
— BB&T Atlanta Open (@BBTatlantaopen) July 23, 2019