The Streak Finally Breaks in San Francisco: Cubs Swept for First Time All Season

SAN FRANCISCO: The Chicago Cubs had spent nearly five months protecting an unusual distinction.

They were the only major league team that had not been swept in a series of at least three games.

Thursday afternoon, that run ended.

Jung Hoo Lee delivered a walk-off single against Cubs closer Daniel Palencia, giving the San Francisco Giants a 4–3 victory and completing a three-game sweep at Oracle Park.

The defeat was particularly frustrating because Shota Imanaga had delivered seven effective innings.

Chicago possessed enough starting pitching to compete.

It could not finish.

A season-long record meets a difficult road trip

Avoiding a three-game sweep for nearly an entire season requires consistency.

Even strong clubs experience difficult stretches when their offense disappears or opposing pitchers deliver exceptional performances.

The Cubs had previously found ways to claim at least one victory in every series.

That changed in San Francisco.

Chicago arrived after sweeping the Los Angeles Angels, carrying momentum into the next portion of its West Coast trip.

The Giants ended that momentum.

The series revealed how quickly a favorable road trip can change when one opponent consistently converts opportunities.

Imanaga gives Chicago a chance

The Cubs received seven strong innings from Imanaga.

His performance limited San Francisco's offense and gave Chicago a realistic opportunity to salvage the series finale.

For a club attempting to compete for the NL Central title, quality starting pitching is particularly important.

It reduces the workload placed on the bullpen and allows the lineup to remain competitive without needing an extraordinary number of runs.

Imanaga accomplished those objectives.

But the bullpen could not secure the final result.

Lee ends the game

The Giants created an opportunity against Palencia.

Lee delivered the decisive single.

The winning run scored, and San Francisco celebrated its sweep.

The walk-off was Lee's first of his major league career.

For Chicago, the final hit completed an uncomfortable reversal.

The Cubs had controlled enough of the game to win.

Instead, they left the ballpark having lost all three games of the series.

September arrives with urgency

Ian Happ acknowledged the frustration of being swept after Chicago had taken pride in avoiding that outcome throughout the year.

The Cubs remained in a strong competitive position, but the division race demanded a response.

Milwaukee had built momentum during August.

Chicago could not afford an extended losing stretch while attempting to keep pace.

The Giants series also served as a reminder that strong starting pitching does not automatically produce victories.

A team must convert enough offensive opportunities and protect late leads.

Against San Francisco, the Cubs did neither consistently enough.

The season-long streak is over.

Chicago's larger ambitions remain alive.