O’Melveny & Myers convinced courts that its opponents didn’t play well with others last year, scoring a historic sanction and a verdict invalidating two patents.

For client SK Hynix Inc., a team led by O’Melveny convinced Northern District of California Judge Ronald Whyte to slap a $250 million sanction on Rambus Inc. for destroying evidence in a memory-chip patent infringement case. Whyte called the sanction a “credit” against a 2009 judgment for SK Hynix for $349 million — plus prejudgment interest and royalties.