The sets will be close but Isner is the better clay player
Due to start at midnight
Isner 1.63, Johnson 2.56
Head to heads are 4-4. The most recent meeting was in February 2017 in Acapulco. Johnson won in straight sets o a hard court. He has won their last 3 matches. All on hard courts. Isner won both their clay matches. Both were in 2015.
Johnson won the title in Houston last year. Isner won the title in 2013.
Isner returned pretty well in the last round. He didn’t face a single break point. He is a pretty decent clay player. He reached the 4th round of the French Open in 2016 and third round last season. He also reached the semi finals in Rome last year beating Ramos, Wawrinka and Cilic.
Johnson played a solid match to beat Tiafoe in straight sets. He served strongly and was broken just once from 7 break chances. In his first match of the week he beat Ernesto Escobedo after losing the opening set. Set two went to a tie break. He was also only broken once in the 3 sets.
Some value on Johnson and I think we will get 3 sets. Back Isner above 1.85.
Update: The sets WERE close. Johnson won 7-6, 4-6, 7-6