Oklahoma City battled its way to a blowout win in Game 1, and its defensive performance n an opposing star was a key reason. On Tuesday night, the Thunder tipped off their second-round series against the Los Angeles Lakers with a 108-90 win. Still unbeaten in this postseason, the Thunder leaned on their great defense to secure a 1-0 lead in Round 2. While there were a plethora of defensive highlights for the Thunder throughout the night, the most impactful may have been their ability to shut down Austin Reaves. Still working his way back from injury, Reaves hasn’t been able to shake off the rust yet, and the Thunder were able to take advantage. In Game 1, Reaves finished with eight points on 3-of-16 shooting in just under 36 minutes of action. Add in six assists to four turnovers, and there wasn’t much going Reaves’ way in Paycom Center.  Of Reaves’ 16 shots, almost none were open looks or in rhythm.…