Ryan Garcia is not taking the Devin Haney fight seriously ... and because of that, the 24-1 boxer will suffer the 2nd loss of his career -- at least that's the way fellow star fighter Shakur Stevenson sees it!
Stevenson, 21-0, joined Babcock on the "TMZ Sports" TV show (airs nightly on FS1) ahead of the Haney vs. Garcia fight on Saturday at the Barclays Center in Brooklyn ... and we asked Shakur for his thoughts.
"I kinda think [Ryan's] not focused.