Getting his hard-court game in gear a few weeks before defending his first Grand Slam title, Cilic edged the 13th-seeded Querrey 7-6 (2), 7-6 (3) on Thursday to reach the Citi Open quarterfinals.
Istomin of Uzbekistan beat Querrey of the United States 7-6 (1), 7-6 (6) in the final of the grass-court Nottingham Open to win his first ATP title.
Simon's chances of a first grass-court title improved after David Ferrer, the top seed at Nottingham, was eliminated in the second round by unseeded Marcos Baghdatis on Tuesday.
American Jack Sock won his first ATP singles title defeating compatriot Sam Querrey 7-6(9) 7-6(2) in the final of the US Men's Clay Court Championship.
Querrey upset Verdasco 7-5, 2-6, 6-4 and Sock knocked off Anderson 7-6 (3), 6-3 to set set up the first all-American final in the Clay Court Championship.
World number five Nishikori will meet second seed Kevin Anderson in the final on Sunday.
Sam Querrey reached the second round of the Paris Masters by beating 2012 runner-up Jerzy Janowicz 6-7 (5), 6-2, 6-4 on Monday.
John Isner and Sam Querrey won their singles matches on Sunday as the US completed a 5-0 sweep of Slovakia in the Davis Cup World Group playoff.
Sam Querrey gave the US a commanding 2-0 lead on Friday night in Davis Cup World Group playoff against Slovakia with a 7-6 (6), 6-3, 6-3 win over Martin Klizan.
Sam Querrey put aside his partnership with doubles team-mate Steve Johnson to start his Atlanta Open with a 7-6, 7-5 win.
The fourth-seeded Verdasco beat Colombia's Santiago Giraldo 6-4, 7-5, and the third-seeded Almagro advanced when American Sam Querrey pulled out because of a back injury.
The sixth-seeded Lopez, who last played this event when he lost in the 2002 quarter-finals, ousted Querrey 4-6, 6-2, 6-3.
Sam Querrey was upset by Alex Bogomolov Jr. of Russia 2-6, 6-4, 7-6 (7) in the opening round of the U.S. National Indoor Tennis Championships.
Britain beat the United States to reach the Davis Cup quarter-finals for the first time since 1986.
Paes and his partner Nestor defeated America's Isner and Querrey 6-2, 6-2, while Saina and Cara Black got past Pavlyuchenkova and Safarova 6-3, 6-2.
Querrey rallied from down a set to beat Ivo Karlovic of Croatia 4-6, 7-6 (4), 6-4 and reach the second round of the Moselle Open.
While Querrey will take on Melzer in the semi-finals, Dolgopolov will meet Monfils for a place in the final.
Querrey had to overcome five match points to beat Nieminen 4-6, 7-6, 7-6 on Wednesday.
This was 120th-ranked Smyczek's first win over a No. 1 seed at any tournament.
Top-seeded Djokovic eased into the second round of Wimbledon with a 6-3, 7-5, 6-4 win over Florian Mayer.
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