PORTLAND, Ore. — Stunned by the arrest of head coach Chauncey Billups in a sprawling alleged poker scheme, the Portland Trail Blazers took to the court Friday night under an interim coach as they navigated an unexpectedly tumultuous start to the new season.

Billups and Miami Heat player Terry Rozier were among those arrested Thursday for what federal law enforcement officials described as their involvement in various illicit gambling activities. Billups was charged with participating in a conspiracy to fix high-stakes card games.

The 49-year-old coach was arrested at his Lake Oswego home before dawn on Thursday, just hours after the Blazers lost their season opener at home to the Minnesota Timberwolves.

The mood was somber in the Blazers’ locker room before Friday night’s game against t

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