Gautam Gambhir turns 38 on Monday. The former left-handed batsman was a great timer of the cricket ball and is one of the best cricketers produced by India. The Delhi-born batsman proved his mettle in all three formats and played numerous astonishing knocks in his illustrious carrer. Mental toughness was Gambhir's biggest strength as he had a knack of performing at big stages. The latter might not have breathtaking numbers at the international level but his ability to come good in crucial matches truly made him the unsung hero of Indian cricket.