Colorado Rockies vs Chicago Cubs Preview
Today's Starting Matchup
Today's starting pitching matchup features Colorado Rockies's Sean Sullivan (0-0, 0.00 ERA) against Chicago Cubs's Javier Assad (4-1, 3.99 ERA).
Colorado Rockies's Sean Sullivan posts an elite 0.00 ERA this season, while Javier Assad has been league-average at 3.99. There is a clear gap in starting pitching quality.
Advanced metrics: Sean Sullivan — FIP 2.77, K% 16.7%, 3.0 IP / Javier Assad — FIP 3.99, K% 16.0%, 38.3 IP
Team Season Comparison
2026 season record: Colorado Rockies 28-46 (.378), Chicago Cubs 38-36 (.514).
Chicago Cubs holds the edge in the season standings, though Colorado Rockies can't be counted out based on head-to-head matchups.
Run differential: Colorado Rockies -88, Chicago Cubs +7. Both clubs are evenly matched in run production.
Recent form: Colorado Rockies on a 1-game win streak, Chicago Cubs on a 1-game losing streak.
Based on starting pitching, Colorado Rockies holds the edge.
Bullpen Analysis
Colorado Rockies bullpen: 13 relievers on the active roster. Key arms: Antonio Senzatela 2.29 ERA, 32K in 39.1IP, Blas Castaño 3.92 ERA, 17K in 20.2IP, Brennan Bernardino 3.99 ERA, 22K in 29.1IP.
Chicago Cubs bullpen: 13 relievers on the active roster. Key arms: Ben Brown 1.74 ERA, 61K in 62.0IP, Caleb Thielbar 4.26 ERA, 22K in 19.0IP, Colin Rea 5.35 ERA, 56K in 74.0IP.
Win Probability
Projected win probability: Colorado Rockies 61% vs Chicago Cubs 39%
Factors: Colorado Rockies's starter owns the lower ERA, Chicago Cubs's home-field advantage. Of course, baseball's inherent randomness means actual results may differ.
Key Tactical Points
Workload comparison: Sean Sullivan averages 3.0 IP per start vs. Javier Assad at 9.6 IP. Getting six-plus innings from the starter significantly eases the bullpen burden.