In 1985, when Boris Becker was 17, the spiky-haired kid became the first German, and youngest player ever, to win Wimbledon. Before his retirement in 1999, Becker—who earned the nickname “Boom Boom” for his bullet-fast serve—racked up 49 tournament wins, including six Grand Slam titles. “Triumph,” the first episode of Alex Gibney’s new documentary series, focuses on those early successes. The second installment, titled “Disaster,” looks at Becker’s decidedly less glorious post-circuit life. In 2002, after a highly publicized trial, he was found guilty of tax evasion. Avoiding prison time, Becker went on to coach Novak Djokovic for three years—he led the number-one-ranked Serbian to six Grand Slam wins—and also became a popular sports commentator. Then, in 2017, Becker’s bank declared him broke (he denied the account was empty), which led to charges that he’d failed to hand over assets that could have been sold to pay off some of his debt. Archival footage plus interviews—with Becker both pre- and post-prison, and with fierce competitors such as John McEnroe and Björn Borg—help tell the story. —Jensen Davis