LONDON (Online) - Pakistani fast bowler Umar Gul and all-rounder Yasir Arafat's names have been included in the Guinness Book of World records for their best performances in Twenty20 cricket. According to media reports, fast bowler Umar Gul's name was added in the book keeping in view his best performance in Twnty20 matches, especially a match that was played against New Zealand in which he got six wickets and was declared man of the match. While Yasir Arafat has got 90 wickets during his 61st Twenty20 matches.