Lowest Single-Season WHIP for the Blue Jays

This list of the Toronto Blue Jays with the best single-season WHIP marks is focused exclusively on starting pitchers. 

The top 10 inevitably features several pitchers that were among the sportsbook favourites to win the Cy Young Award. 

Lowest Single-Season WHIP for Toronto Blue Jays

1. Alek Manoah — 0.99 (2022)

Alek Manoah is the only Blue Jay to post a WHIP below 1.00. 

Manoah burst onto the scene as a rookie in 2021 and followed it up with a third-place Cy Young finish in 2022.

2. Roger Clemens — 1.03 (1997)

Roger Clemens holds numerous records from his two historic seasons as a Jay.

Clemens won the Cy Young and Triple Crown in 1997. His 1.03 WHIP was the best single-season mark in Jays history for 25 years.

3. Marco Estrada — 1.044 (2015)

Marco Estrada had a short but impressive peak. The 2015 campaign was the best of his career.

Estrada earned Cy Young votes and led the AL in hits per nine innings.

4. Robbie Ray — 1.045 (2021)

Robbie Ray won the Cy Young in his only full season as a Blue Jay.

Ray’s performances for Toronto earned a big-money free agent contract with the Seattle Mariners in the 2021-22 offseason. 

5. Roy Halladay — 1.053 (2008)

Roy Halladay led the majors in WHIP and strikeout-to-walk ratio in 2008. He pitched the most innings in the AL.

Still, Halladay was only runner-up for the Cy Young behind Cliff Lee. 

6. Jimmy Key — 1.057 (1987)

Jimmy Key’s 1987 was similar to Halladay’s 1987. 

Key led the majors in WHIP and finished second in Cy Young voting to Clemens. Key’s ERA+ was the best in the majors. 

7. Kevin Gausman — 1.062 (2025)

Kevin Gausman earned Cy Young votes in his first two seasons as a Blue Jay, but it was his fourth campaign that featured the lowest WHIP.

Gausman leads all Jays’ starting pitchers in WHIP. 

8. Roy Halladay — 1.07 (2003)

In 2003, Halladay won his first Cy Young. 

He led the majors in bWAR, innings, and strikeout-to-walk ratio. Pedro Martínez finished third in Cy Young voting, but had a slightly better WHIP. 

9. Roger Clemens — 1.095 (1998) 

Clemens led the AL in hits per nine and strikeouts per nine in 1998 en route to the second of back-to-back Cy Young Awards.

A slightly higher walk rate than in 1997 led to a worse WHIP for Clemens. 

10 Roy Halladay — 1.10 (2006)

A brilliant season in 2006 saw Halladay finish third in the Cy Young race.

His 1.10 WHIP was the third-best mark of his time as a Jay.