 Weimer emerged as one of the Chicago Cubs' top starting pitchers in the first part of 20th century.He went 21–9 with a 2.30 ERA in his 1903 rookie season and 20–14 with 1.91 in his sophomore year.After going 18–12 with 2.26 in 1905, he was sent to the Cincinnati Reds for third baseman Harry Steinfeldt and Jimmy Sebring before 1906.