Oklahoma City has been the league’s best team for a couple of seasons, but that dominance hasn’t necessarily translated to the second round. Over the past couple of years, the Thunder have quickly grown out of their rebuild and into a championship contender. While the Thunder captured their first NBA title last season, they also still have plenty of room to grow, especially in the postseason. After showing some growth by grabbing a convincing win in Game 3 in Phoenix en route to sweeping the Suns, the Thunder’s second-round matchup presents another opportunity to show their growth. On Tuesday, the Thunder will tip off the second round with a matchup against the Los Angeles Lakers. Although the Thunder are heavy favorites and should be heading back to the Western Conference Finals, they still have something to prove. Much like the Thunder wanted to put together a good Game 3 to overcome their past troubles, they should be determined to make this second round win a convincing one.…