Basketball is the number one sport in countries like China, the Philippines, and a top 3-7 sport in many, if not most other countries. Plenty of legitimate sports sites rank it the second or third most popular sport in the world. Shaq is easily in the top five most famous/popular basketball players of the last few generations - probably all time. He does ads in Australia on free-to-air TV (where he never bounced a ball) and in other countries across the globe. He has over 250 TV commercials to his name, many are international campaigns.
Springsteen is popular with a certain generation of music fans (and even then, he fits a genre so not even all music fans) and I'm not sure his music is playing on repeat in places China, the Philippines, Lithuania or Spain? Is he doing car commercials in Spain? Betting ads in the UK?
Springsteen hasn't had a top 40 single chart in the US, UK or Australia since 1997 - and even that was a re-release on the Jerry Maguire Soundtrack. His original music releases haven't been relevant since the late 80’s. Anyone under thirty would walk past him in the street without a second thought.
Shaq v Taylor Swift would be WAY closer.