FFS FAA was a HUGE chocker against Isner. Three DFs trying to serve out the first set against Isner; its the biggest choke job I've ever seen and if we had any doubt he screwed up serving out the 2nd set as well. Other than that his serve is great for his age. He's 3rd in aces for the year on clay and that is pretty awesome for his age.
FAA has gone from 60% serve points at ATP level in 2018 to 62% in 2019. Low by my book and agree hard courts is his best, but I like all the time he's invested in clay. Its really helped his game and just exploded onto hard courts after the South American clay court swing. Compare that to Cilic, Nishikori, and Monfils who darn near ended their careers trying to vulture on SA clay over the last few years. For Felix to come off that circuit and play so well on hard courts is amazing. 52.9% points won on sunshine swing at ATP level, with 65% points won on serve (for 18 that is a very solid number and I recall Shapo at 66.5% at age 18 was better than all but the best servers at that age (Sampras) and the year is young for FAA.

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The kid is 18 years old and in top 32 and no flash in the pan; he's got goat written all over him.