Wladimir Klitschko is the heavyweight champion of several different organizations that claim to represent boxing, but there’s no point in listing them because whatever group doesn’t recognize Klitschko as heavyweight champion is meaningless. The guy is 63-3-0 with 54 K.O.’s, and he’s gunning for his 18th consecutive title defense (and approaching Joe Louis’s record of 23). That’s all you need to know to know that this will be real boxing. Tonight is his first fight in the U.S. in seven years, and his opponent, Bryant Jennings, is unbeaten in 19 bouts. Jennings promises plenty of action: “This fight will end in a knockout: It’s either going to be him or me.” It’s a rare opportunity to see a great fighter back at the Garden, which Klitschko correctly calls “the biggest stage in the world,” so if you have a T-shirt with the Ukrainian flag, be sure to wear it. You can get together with friends at home and watch on HBO, but trust us, a trip out will be worth it just to enjoy the crazy crowd.

Sat., April 25, 7 p.m., 2015