All of them were students of Jeff Carlson at Elk Grove High School.
Davis and Freitas have been making the trip between Triple-A and MLB all season because of injuries on their respective clubs. This will be Tellez' first appearance in the Bigs during the regular season.
Freitas has also seen some time this year in Seattle when Mariners' starting catcher Mike Zunino was suffering from some injuries, but most of the year he's been with the Tacoma Rainiers. He, too, will likely do some filling in as Seattle has a pretty good chance at making the playoffs, battling with the A's and the Astros in the American League West.
After two seasons with the Buffalo Bisons in the International League, Tellez will likely get an opportunity for a few starts, especially because the Blue Jays are out of the post-season race. He had a good year in Buffalo, batting .270 with 13 homers, playing a solid first base.