Raab tells IBTimes Singapore the S.League giants can produce positive results in future.
Injury-hit RCB face stiff test against defending champions SRH in the tournament opener.
JDT crushed the Philippines' side 4-0 during their first-leg last month.
Home defeated the Vietnamese Cup winners in the first-leg last month.
Manchester United face Everton in the Premier League clash on Tuesday.
In-form Sri Lanka eye series win after stalemate in Tests and ODIs.
The Supersereis Premier event returns to Kuching after a 11-year-gap.
Tampines, who are placed third in Group G, need nothing less than a win to stay alive in the tournament.
While Lee starts as the top seed, Lin is the seventh-seeded player at the Superseries Premier.
Felda host Group G leaders Ceres in a crucial clash on Tuesday.
Defending champion Sunrisers Hyderabad take on Virat Kohli's Royal Challengers Bangalore in tournament opener.
Tampines were crushed 4-0 by Hanoi in their earlier meeting last month.
The Undertaker walked away from the Arena on Sunday to chants of "Thank You, Taker".
Federer outclassed Nadal in straight sets in the title match on Sunday to take his season record to 19-1.
With growing pressure on Arsene Wenger, his team hosts Pep Guardiola's men on Sunday.