Did her marriage to John McEnroe ruin her career and vice versa?
Mac didn't want Tatum to work at all, so she basically gave up what could have been some very good career years in order to please him.
And he, despite being one of the most phenomenally talented players of his time, never even made another Grand Slam singles final after marrying her (although Ivan Lendl might have had something to do with it as well).
https://www.datalounge.com/thread/30450915-careers-ruined-by-relationships