LOS ANGELES — Starting center Deandre Ayton will sit out of the Lakers’ Sunday home game against the Miami Heat because of a back ailment.

Ayton was ruled out because of back spasms, the same ailment that led to him not playing in the second half of Friday’s road win over the Memphis Grizzlies.

The 27-year-old 7-footer entered Sunday as probable before being downgraded to questionable two hours before tipoff, eventually being ruled out about an hour before the game started.

“He’s still dealing with some tightness and spasms in that mid-back,” Coach JJ Redick said pregame.

Ayton (nine points in 17 minutes) stayed back near the Lakers’ locker room after halftime during the game against the Grizzlies, getting his back tended to by the team’s medical team before rejoining the team on the b

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