The MLB season is entering Week 10, leading to exciting promotions of top prospects like Jac Caglianone and Coby Mayo, who are now prime waiver wire pickups for fantasy managers. Caglianone, the Kansas City Royals' latest call-up, boasts remarkable power potential, demonstrated by his .322 average in the minors and a staggering 15 home runs. Meanwhile, Mayo has been promoted again by the Orioles, potentially filling a gap left by injured players. Although he struggled during previous stints in MLB, his Triple-A performance suggests a breakout could be on the horizon. Conversely, Jordan Lawlar returns to Triple-A after a disappointing run in the majors, where he faced challenges against breaking balls. Despite his minor league success, prospects may need to navigate their respective teams' lineups to secure consistent playing time.