The pair met in the finals of last year’s Miami Open and the Australian Open in January.
World number three Jannik Sinner will face defending champion Daniil Medvedev in the semi-finals of the Miami Open - a rematch of the Australian Open final won by Sinner and last year's Miami title match.Italy's Sinner, who rallied from two sets down to beat Medvedev and claim his first Grand Slam title at the Australian Open, will play in his fourth semi of the season after dealing with lively Machac in 91 minutes.
Danielle Collins and Ekaterina Alexandrova will meet in the semi-finals of the WTA Miami Open after victories in the last eight on Wednesday.Collins reached the semi-finals of Miami six years ago as a qualifier and at 53rd is the lowest ranked semi-finalist in the tournament.