The Cubs have signed left-hander Tsuyoshi Wada to a one-year, Major League contract, the team announced. The deal is worth $4MM, and another $2MM available in incentives, MLB.com’s Carrie Muskat reports (Twitter link). The new contract overrides a $5MM team option the Cubs held on Wada’s services for the 2015 season. Wada is represented by the Octagon Agency.

Wada, 33, finally got his first taste of Major League action last season, posting an impressive 3.25 ERA, 7.4 K/9 and 3.00 K/BB rate over 69 1/3 IP (13 starts) with the Cubs. Following a distinguished nine-year career in Japan, Wada signed a two-year, $8.15MM deal with the Orioles in December 2011, though he never threw as much as a pitch for the O’s thanks to Tommy John surgery.

After signing a minor league deal with the Cubs last offseason, Wada successfully rebuilt his value and has now worked himself into Chicago’s rotation plans for 2015. The Cubs have been widely rumored to be interested in signing a top free agent pitcher (possibly Jon Lester) to add to Wada, Jake Arrieta, Kyle Hendricks, Travis Wood and Edwin Jackson, plus options like Jacob Turner and Felix Doubront are also in the rotation mix.