Lucknow, Apr 14 (UNI) Veteran Mahendra Singh Dhoni and Shivam Dube showcased their composure under pressure, guiding Chennai Super Kings (CSK) to a nail-biting 5-wicket victory over Lucknow Super Giants (LSG) with just three balls to spare at the Bharat Ratna Shri Atal Bihari Vajpayee Ekana Stadium here on Monday.