Venus Williams served up plenty of history-making game this US Open.

The 45-year-old player walked into the tournament as the oldest player in the past four decades — and spent much of her three weeks on the court destroying competitors who were just half her age.

The secret to coaching a superstar? Letting her take the lead — but knowing when to tell her to take a break, her trainer, Diego Ayala, told The Post. 4

“When you have a player at the caliber of Venus and the pedigree of Venus, you just try to figure out what the player is looking for from a coach and tap into that,” explained Ayala, 46, a pro-trainer based out of Florida.

The pair have only been training together since June, but under Ayala’s tutelage, Williams became the second-oldest player to win a WTA Tour-level

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