 Nyorai kupfuurira kweiyi ndima - Pana January 6, 2003, Timlin akasaina chibvumirano chegore rimwe, 1.85 miriyoni neBoston Red Sox. Mumwaka wa2003, akaonekwa mumitambo makumi manomwe nemaviri yeBoston, achiunganidza rekodhi ye6 4, aine 2 kuchengetedza uye 3.55 ERA. Mumutambo wepositi, akaonekwa mumitambo mitatu yeALDS kurwisa Oakland Athletics, uye mitambo mishanu yeALCSvachirwa neNew York Yankees. Mumitambo misere iyoyo, akatamba mainnings, akatarisana nevatambi 32, achirova 11 uye achibvumira kufamba kaviri chete, kurova kamwe chete, uye pasina kumhanya. Mushure memwaka, Timlin yakasainwazve neRed Sox kune makore maviri, 5.25 miriyoni chibvumirano munaNovember 2003. 