Hyderabad captain Kane Williamson top-scored for his side with a 47 off 36 balls while Yusuf Pathan scored a brisk unbeaten 45 off 25 deliveries to take Hyderabad to 178-6 in their 20 overs.
He led tributes to Watson.
Watson's ton helped Chennai claim their third IPL title.
Dhoni, who led Rising Pune Supergiant in 2016 and 2017, said: "Last two years we were not there but our fan following kept increasing". Captain Kane Williamson lauded the way CSK handled the most high-pressure match of the lot, the final, not giving Sunrisers any opportunities while chasing what he thought was a "competitive total". The Afghan smashed 34 off 10 balls which included two boundaries and four sixes at the Eden Gardens in Kolkata, the Hindustan Times reported. But it's a challenge to get that bat-ball balance. Watson scored 555 runs in 15 matches at an average of 39.64 this year.
At the onset of CSK's chase, Watson went without scoring for ten balls as he struggled to read Bhuvneshwar Kumar's swing bowling. The older players such as Shane Watson, Ambati Rayudu, Dwayne Bravo, Suresh Raina and MS Dhoni have all had pivotal contributions to CSK's journey towards the final. As many as 92 runs came through the big hits.
Afghanistan teen sensation Rashid Khan returned figures of 0-24 for Hyderabad but Watson hit the other bowlers to every corner of the stadium.
Later Dhoni took to Instagram to post a picture of himself, Ziva and his wife Sakshi thanking people for supporting CSK and congratulating Shane Watson for his 117 not out that brought CSK's victory.
Watson was just one of nine members of the Chennai squad to be aged over 30. It's frustrating, because we played some really good cricket for the large part. Thus, the IPL 2018 finale is not likely to experience any weather hindrance as the chances of rain are not during the match.
"The age-group of the boys was definitely a concern as we had to keep them fit because of the frequency of the games. Fielding is one department where you can't make excuses, compared to a year ago, I've worked really hard in my fielding".
On his Sunday's innings, where the Australian produced a masterclass against one of the best bowling attack in the league, the 36-year-old said: "After those first ten balls I was only hoping to catch up to at least a run-a-ball".
The winners of the final were guaranteed a minimum $4 million in prize money.