By Jimmy Traina The Grizzlies’ star’s electrifying dunk brought out the best in the broadcaster. 1. It’s not just players, such as Jayson Tatum, Brandon Ingram and Jalen Brunson, who have had memorable first-round performances in the NBA playoffs. Turner broadcaster Ian Eagle is peaking at the right time, too. Eagle has enjoyed quite a run that started with his noteworthy performance during the NCAA tournament, which we discussed on his recent SI Media Podcast appearance. Eagle gave us the call of the playoffs Tuesday night when Grizzlies star Ja Morant gave us the play of the postseason. Late…