One Nathan Eovaldi comp might be Seattle lefthander Yusei Kikuchi.
Or not.
Kikuchi signed a multiyear free agent contract less than one month after Eovaldi signed his multiyear free agent contract in the 2018-19 offseason. According to Cot's Baseball Contracts, Kikuchi signed for four years and $56 million with complicated options through 2025. Eovaldi's contract is for four years and $68 million.
Kikuchi, who is 16 months younger than Eovaldi, has posted 1.4 fWAR in 39 starts and 198.2 innings since joining the Mariners. Entering Thursday's solid start, Eovaldi had posted 0.1 fWAR in 30 appearances, including 19 starts, in 105 innings.
This season Kikuchi has posted 1.1 fWAR over 37 innings in seven starts while, entering Thursday's game, Eovaldi had posted 0.3 fWAR over 37.1 innings in seven starts.
Each pitcher has generally disappointed since signing a free agent contract.
https://www.fangraphs.com/players/yusei-kikuchi/20633/stats?position=P
https://www.fangraphs.com/players/nathan-eovaldi/9132/stats?position=P