WBC super-flyweight champion Srisaket Sor Rungvisai left for the United States on Wednesday for his fourth title defence against Mexican challenger Juan Francisco Estrada.
In his first fight in more than seven months, Srisaket will take on Estrada in a rematch -- a mandatory fight -- at The Forum in Los Angeles on April 26.
Srisaket, 32, defeated former flyweight champion Estrada at the same venue in February last year with a majority decision (114-114, 115-113 and 117-111).
Srisaket then beat another Mexican Iran Diaz on a unanimous decision (119-109, 120-108, and 119-109) in his third defence at Impact Arena, Muang Thong Thani, last October.
"This is a very important fight. I'm fully fit, more than 100 percent actually, and ready for this fight. I'm confident I can knock him [Estrada] out this time," said Srisaket.
"I feel no pressure. I'm just going to concentrate on doing my best. Hopefully the Thai fans will give me all their support. I will try to bring back the belt and make the Thai people happy again.
"I will also try to defend my title for as long as possible," added Srisaket, who holds a record of (47-4-1, 41KOs).
Estrada (38-3, 26KOs), meanwhile, believed he was close to beating the Thai champion last year and will be determined to avenge his defeat 14 months ago.
"I think this will be another exciting fight, but I will win it this time," said the 29-year-old Estrada. "I nearly knocked him out in the last round of our first fight. I will not miss an opportunity to beat him this time. I'm ready to become a champion.
"I hope Srisaket is well-prepared. We will give all the boxing fans another great fight," added the Mexican.
Srisaket's manager Surachart Pisitwuttinan admitted that Estrada is a great fighter and has no weakness. However he believed Srisaket can beat the Mexican again.
"I know that Estrada will be fully ready for this fight," said Surachart. "He's great at attacking and defensively he's very good as well. His stamina is also good.
"But Srisaket is also well prepared. He's been training hard and is very determined," added Surachart.
"I'm certain Srisaket will not disappoint the Thai fans."