ATLANTA—The Milwaukee Bucks suddenly are facing the daunting challenge of possibly having to move forward in their Eastern Conference finals without their two-time MVP. Giannis Antetokounmpo sustained a hyperextension of his left knee and and was forced out of the Bucks’ Eastern Conference finals game against the Atlanta Hawks on Tuesday night. “It’s not good,” Bucks forward P.J. Tucker said. “It’s not good losing anybody on your team and losing your best player stinks.” The Hawks won 110–88, evening the best-of-seven series at 2–2. Antetokounmpo’s status for Game 5 at Milwaukee on Thursday night is not known. Antetokounmpo was defending a jam by Hawks center Clint Capela with 7:14 remaining in the third quarter when his left knee appeared to buckle. He fell to the floor in obvious pain, grimacing and clutching his knee. Bucks coach Mike Budenholzer said the team would learn more about Antetokounmpo’s status on Wednesday. “We’ll …