Steve Johnson, facing camera, and Tennys Sandgren embrace after the Houston final on Sunday.

An emotional Steve Johnson celebrates his second Houston title nearly a year after his father, Steve Johnson Sr., passed away.

Steve Johnson goes back-to-back on Sunday at the Fayez Sarofim & Co. U.S. Men's Clay Court Championship in Houston.

Max Mirnyi and Philipp Oswald lift the trophy in Houston.

Philipp Oswald and Max Mirnyi celebrate their doubles title in Houston with the traditional pool dive.

Steve Johnson advances to the Houston final for a second straight year.

Steve Johnson is presented with the Langston Trophy for sportsmanship in Houston.

No. 8 seed Tennys Sandgren ousts 39-year-old Ivo Karlovic in Houston Saturday to advance to his maiden ATP World Tour final.

Philipp Oswald and Max Mirnyi end the seven-match winning streak of Bob Bryan and Mike Bryan Friday evening in Houston.

Defending Houston champion Steve Johnson ousts top seed Isner to move within two victories of retaining his title.

#NextGenATP American Taylor Fritz beats third seed Jack Sock to reach his second ATP World Tour semi-final.

#NextGenATP American Taylor Fritz advances to his first ATP World Tour semi-final on clay Friday by beating third seed Jack Sock in Houston.

Croatian Ivo Karlovic, 39, becomes the oldest ATP World Tour semi-finalist since 1993 when Jimmy Connors did so in San Francisco.

Mike Bryan, left, and Bob Bryan are going for their seventh Houston doubles team title this week.

John Isner wins his eighth match in a row on Thursday in Houston.

The boys and girls who play at Sunnyside Park in Houston will soon have like-new tennis courts.

The courts at Sunnyside Park in Houston will soon be resurfaced thanks to ATP World Tour stars.

Mike Bryan, Bob Bryan, Frances Tiafoe and John Isner all donated money to help resurface the courts at Sunnyside Park in Houston.

Bob Bryan and Mike Bryan drop just two games to reach the Fayez Sarofim & Co. U.S. Men's Clay Court Championships quarter-finals on Wednesday.

Nick Kyrgios will carry a 4-0 FedEx ATP Head2Head record into his clash with Ivo Karlovic.

Denis Kudla takes on Ivo Karlovic in the Houston second round Wednesday.

Defending champion Steve Johnson comes within two points of defeat Tuesday in Houston, but ousts fellow American Ernesto Escobedo in three sets.

Frances Tiafoe earns his first tour-level clay-court win (1-5) against wild card Mackenzie McDonald at the Fayez Sarofim & Co. U.S. Clay Court Championship Monday.

Denis Kudla earns his third career tour-level victory on clay at the Fayez Sarofim & Co. U.S. Clay Court Championship against former champion Fernando Verdasco.

Nick Kyrgios, this year's Brisbane champion who is debuting in Houston, loses his opening-round doubles match Monday with partner Matt Reid.

Fresh off his maiden ATP World Tour Masters 1000 title in Miami, top seed John Isner attempts to win his second Houston title this week.

Ernesto Escobedo and coach Peter Lucassen are feeling positive about Escobedo's 2018.

#NextGenATP American Taylor Fritz, who made the Round of 16 at Indian Wells, practises Saturday in Houston ahead of his first-round match against Tim Smyczek.