Undefeated at home — and with a chance to keep running up the tab.

The Knicks are protecting Madison Square Garden under new head coach Mike Brown, turning home games into statement nights to open the season.

They’ve rebounded from a three-game road skid to stack four straight home wins entering Tuesday’s matchup against the Memphis Grizzlies, the first leg of a back-to-back that continues Wednesday against the Orlando Magic .

The Knicks entered the back-to-back a perfect 6-0 at home, tied with the Denver Nuggets for the most home victories among the six remaining teams still unbeaten in front of their own fans.

“We had lost three in a row, and a lot of people thought the sky was falling. We hadn’t been together long. I’ll be the first to admit, I didn’t know when to put Josh [Hart

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