To win back-to-back World Series titles is a tall order for any team in the MLB.

And if you ask former Boston Red Sox first baseman Mo Vaughn, it takes “a tremendous amount of concentration” to pull off the feat.

Last season was a blockbuster year for the Red Sox, who won 108 regular-season games before claiming the World Series title in just five games against the Los Angeles Dodgers. With most of last season’s roster still intact, some have wondered if Boston could be headed toward another championship in 2019.

But Vaughn, who spent the first eight seasons of his career with the Red Sox, explained why he thinks it is so difficult for teams in the MLB to earn back-to-back titles.

“It’s hard to do because you have to concentrate and focus. Everything has to go right, no injuries, no pitching injuries. Eight guys playing consistently all year long, without missing a lot of time,” Vaughn told CBS Sports.

The last time a team to earn back-to-back World Series titles was the New York Yankees, who won three straight championships from 1998 to 2000. Vaughn believes there was a reason for that.

“You look at that Yankees team in ’98, they were just so power-packed, it was going to be tough to beat them anyway,” he said.

Time will tell if the Red Sox can make Vaughn a believer.

Thumbnail photo via Gary A. Vasquez/USA TODAY Sports Images