Bobby Portis scores season-high 30 points, but Knicks starters struggle in loss to MiamiPortis stepped up off the bench, but starters dug Knicks an early hole12/21/2019, 4:24 AMDec 20, 2019; Miami, Florida, USA; New York Knicks forward Bobby Portis (1) dunks the ball against the Miami Heat during the first half at American Airlines Arena. Mandatory Credit: Jasen Vinlove-USA TODAY Sports / Jasen Vinlove