WATCH: Indian Wells Day 4 Wrap

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Alexander Zverev vs. Jenson Brooksby

Brooksby has had some impressive results this year. The 20 year-old has made a final in Newport, a semi in D.C. and the fourth round at the US Open. He’s improved his ranking from No. 152 to No. 79. He has beaten Felix Auger-Aliassime, a Top 15 player. Now the American has a chance to do something new: Beat a Top 5 opponent in Zverev.

It’s an interesting matchup. Zverev is a rhythm player, and once he finds one on his serve and his ground strokes, he’s tough for anyone, even Novak Djokovic, to overcome. Can Brooksby, whose specialty is disrupting rhythm and putting the ball where his opponents don’t like it, disrupt Zverev? I think he can, for a set. And then Zverev’s superior serve and heavier forehands and backhands will take their expected toll. Winner: Zverev

Carlos Alcaraz vs. Andy Murray

A May-September matchup: Alcaraz is 18, Murray is a 34; the Spaniard is winding up his career, the Scot is winding his down. But this would be an intriguing match-up no matter what their ages. Alcaraz moves crisply and hits fearlessly. Murray doesn’t do either of those things as well as he once did, but he brings half-a-lifetime’s worth of winning experience to the court. Each, in his own way, is on the way up: Alcaraz is almost certainly heading for the Top 10; Murray, in his long-running comeback, seems to be heading for a breakthrough result that reminds us of what he could do at his best. A win here would qualify. Winner: Murray

We've gotten to see Raducanu and Fernandez since their US Open breakthroughs; on Sunday, we get another look at Alcaraz.

We've gotten to see Raducanu and Fernandez since their US Open breakthroughs; on Sunday, we get another look at Alcaraz.

Petra Kvitova vs. Victoria Azarenka

Kvitova, 31, and Azarenka, 32, have played eight times since 2008. Kvitova has the head-to-head edge. She leads 5-3 overall; she’s 5-1 in their last six meetings, and she has won three of their four biggest matches, including two at Wimbledon and one in the final of the WTA Championships in 2011. Neither is quite the player she was back then, when they were fighting for No. 1 and meeting late at majors. But when both are at their best, or something close to their best, Kvitova is still the better player. Winner: Kvitova