Silas Kiplagat akakunda Mwangangi muPrisons Cross Country muna 2011, asi akazvigadzirisa nekusimudza zita rekutanga revakuru vevarume pa2011 African Cross Country Championships. Mumwedzi iwoyowo akamhanyira kuLisbon Half Marathon ndokuva mumhanyi wechipiri shure kwaZersenay Tadese, uyo akanga achimhanya panguva iyoyo-yechipiri-yakakurumidza nguva. Akadzivirira zita rake paRabat Half Marathon mwedzi wakatevera. Muchikamu chechipiri chemwaka, akauya wechitatu paDam tot Damloop munguva yakanakisisa yemakiromita gumi yemaminitsi 45: 13. Akakunda kwenguva yechipiri yakatevedzana kuParis 20K akabva apedza basa rimwe chetero kuValencia Half Marathon, kwaakavandudza zvakanakisisa zvake pamusoro pemurefu kusvika 59:45 maminitsi. Muna December akauya wechitatu paMontferland Run. Akanga ari mumhanyi wechipiri kuna Zersenay Tadese paLisbon Half Marathon munaKurume 2012. Akanga ari mumwe wevatambi vepa 2012 Rotterdam Marathon uye vamhanyi vaviri vepamusoro vakapedza pasi pemaawa maviri nemaminitsi mashanu. Pa2012 World Half Marathon Championships
muKavarna, Bulgaria, akahwina menduru yebronze nenguva ye 1:01:01 maawa, uye akabatsira vaaitamba navo kuhwina mukombe wechikwata. Kubuda kwake kwokupedzisira panhambo iyoyo gore iroro, kwakamuona achipedza somumhanyi wechipiri muValencia.