The first weekend of the 2026 MLB season is over, and we've learned so much in this new era of the sport. The ABS system has been a smashing success for everyone but the umpires, and the two teams that delivered arguably the greatest World Series of all time are, shockingly, still really good. Along with the Los Angeles Dodgers and the Toronto Blue Jays , three other teams made it through their opening series without a loss. Here are the teams still undefeated heading into the first full week