Watson and Du Plessis slammed half-centuries in the chase after CSK spinners choked the Capitals.
In their second chance to qualify for the final, CSK aims to break DC's backbone on Friday.
In a crucial clash, Delhi Capitals will take on Chennai Super Kings in the 2nd qualifier.
Fans running into the stadium to meet Dhoni has become a common scene nowadays.
Shane Watson was awarded the Player of the Match for his 26-ball 44 with seven boundaries.
Here are the lesser known stats from CSK's last over victory over the Delhi Capitals.
All the major stats and numbers from the thrilling game between Delhi and Chennai at the Feroz Shah Kotla.
Chennai Super Kings avenged their loss at Kotla from 2018.
It was eventually an easy victory for CSK at the Kotla.
Focus will be on continuing the winning momentum for both the teams.