Serena Williams' dispute with the chair umpire during the 2018 U.S. Open final is the latest issue she's had with match officials at the Grand Slam tournament.

Williams argued in her 6-2, 6-4 loss to Naomi Osaka on Saturday, saying on court at one point: "This is not fair. This has happened to me too many times."

Former NZ tennis professional and coach Dave Mustard told Mike Hosking coaches should keep quiet during the matches.

"Once you are on the court, you are on your own, coaching really shouldn't be allowed once the player is on court."

LISTEN ABOVE AS DAVE MUSTARD SPEAKS TO MIKE HOSKING