Well this has incredible value in my eyes. I will go again with higher stake because i really believe it is worth. Both Cilic and Ramkumar have strong serves and should be able to keep it in first 4 games. Cilic definetly plays out of form recently, maybe ofc due to fact he became father of a boy and his personal life is now a priority. But since Indian is not that good on return games i think Marin will have good chances to go unbroken. Same on the other side. Cilic has to go 'Djokovic return mode' from the beggining if he wants to break his oponent. Ramkumar has nice serve volley aproach and that tactic should work at the start when Cilic is still warming up basicly.
For the number statistics:
Cilic played 11 matches this season with 4x break activity in first 4 games
Ramanathan played 10 matches in 2020. and got broken only once in first 4 games.
I would say numbers are prety solid here, and match will be played on hard surface indoors which additionaly benifits our bet here.
Cilic vs Ramanathan betting tips
score after 4 games - 2:2 (Stake: 8)Odds: 1.80 at Bet365
Result: 2-2 WON (+6.4 units)