It is thought the server has the advantage—not always. The fastest recorded serve at 157 mph was by John Isner. He recorded 113 aces during his 11-hour 2010 Wimbledon marathon, beating Nicolas Mahut. In the 2007 Indianapolis Tennis Championship Quarter Final, Sam Querrey displayed 10 consecutive aces against James Blake.
In another match, Canadian player Milos Raonic impressed the crowd and his opponent with 47 aces. Georgina Garcia Perez (Spain) recorded the fastest women’s serve at 136 mph. On the flipside, there’s the dreaded double fault (df) where players Anna Kournikova did 31 df and Alexander Bublik showed 25 df, which not even the weekly amateur players would even come close to doing. On average, professionals do up to three double faults per match, but considering how hard they are serving, this isn’t too bad. Speaking of serving, are you possibly displaying a foot fault? If your answer is no, you must be able to watch your feet as you swing upward at your ball toss (remarkable!).
Once the server serves and the receiver returns the ball, they can compete and rally, which, in 1984 during a Virginia Slims tournament, players Vicki Nelson and Jean Hepner rallied a point for 29 minutes in a 643-shot rally (truly amazing!).
In the Challenger event, two players were recognized for their powerful serving: Albano Olivetti at 160 mph and Sam Groth at 163 mph. Watch out for current ATP French player Giovanni Mpetshi Perricard doing a second serve clocked at 148 mph. Who does that? Most can’t even come close to doing a serve of that magnitude. My personal best was clocked at 103 mph back in the day.