As the calendar flips from April to May, the 2026 MLB season has already delivered more than its fair share of thrills, spills, and jaw-dropping moments. But if you think the first month was exciting, just wait until you see what is on tap for this week. We have identified five series that are ABSOLUTELY MUST-WATCH, featuring heavyweight National League matchups, critical division battles, and postseason rematches that carry more intrigue than a thriller novel. If you are a baseball fan, clear your schedule — because this week is going to be EPIC. First up, and perhaps most tantalizingly, is the Chicago Cubs versus the San Diego Padres in a three-game set that is a DIRECT rematch of last year's NL Wild Card Series. These two teams have a genuine rivalry brewing, and the bad blood from their postseason clash — which the Cubs won in three games after the Padres took Game 2 — adds an extra layer of intensity to every pitch. The regular season series between these clubs was remarkably even in 2025, with both teams winning three games and scoring exactly 25 runs each over their six meetings. This year, both teams are among the best in the National League: the Padres sit at 18-9, a half-game behind the Dodgers in the NL West, while the Cubs are 17-11, one game behind the Reds in a competitive NL Central. Every game matters. The player to watch in this series is Seiya Suzuki, who enters as hot as any hitter in baseball. After a slow start that landed him on the injured list with a sprained knee, Suzuki has been ABSOLUTELY ON FIRE, recording multiple hits and a home run in four of his last six games. His OPS over the past week is a STAGGERING 1.183, making him the most dangerous hitter in either lineup. On the Padres' side, the dominant Mason Miller continues to be a weapon out of the bullpen, and his presence in the late innings gives San Diego a significant advantage in close games. But this series is just the beginning of a week packed with compelling baseball. The National League heavyweight matchups extend beyond the Cubs and Padres, with several other series featuring teams jockeying for position in what promises to be a fiercely competitive pennant race. The cross-division games are equally fascinating, pitting teams with contrasting styles against each other in ways that could reveal strengths and vulnerabilities that will shape the standings for months to come. What makes this week particularly significant is the timing. May is when the pretenders begin to separate from the contenders, and the results of these series could have OUTSIZED implications for the rest of the season. Teams that perform well this week will carry momentum into the heart of the schedule, while those that falter may find themselves playing catch-up for months. The stakes are HIGH, the matchups are INTRIGUING, and the baseball promises to be EXCEPTIONAL. Do not miss a single pitch.