Roger Federer defeated Colombian Alejandro Falla 6-3, 6-3, 6-4 in the opening round.
The 34-year-old giant defeated home hope Alejandro Falla, 6-3, 7-6 (7/4) in the final to celebrate his first title in five years.
The victory speaks a lot as Sijsling had made finals at Australian Open and Vasselin had appeared in the Wimbledon semifinals.
Falla, a Bogota resident, is seeking his first ATP Tour title. The 29-year-old left-hander will face Canada's Vasek Pospisil on Saturday in the hard-court tournament at Centro de Alto Rendimiento. Pospisil beat Italy's Matteo Viola 3-6, 6-3, 6-2.
They will now fight it out with second seeds Edouard Roger-Vasselin of France and Igor Sijsling of the Netherlands in the final.
Sam Querrey beat Alejandro Falla for the second time in less than a week, defeating the Colombian 6-3, 6-3 in a first round match at the US National Indoor Championships on Tuesday.
Colombia's Alejandro Falla saved six set points in the second set to post a 7-6 (10/1), 7-6 (12/10) victory over Flavio Cipolla in the first round of the ATP Tour's SAP Open on Wednesday.
Juan Martin del Potro overcame a first set back problem to make a winning start at the Swiss Indoors on Wednesday with a 6-4, 6-1 defeat of Alejandro Falla.
World number six Tomas Berdych reached the quarter finals of the Japan Open on Thursday after beating Colombia's Alejandro Falla in a straightforward 6-3, 7-5 win.
Nikolay Davydenko beat lucky loser Sanam Singh of India 7-5, 6-4 Wednesday in the first round of the Malaysian Open.
Switzerland's Roger Federer has his eyes on medals from both singles and doubles after his stuttering victory in the men's singles first round against Alejandro Falla of Columbia at the London Olympics.
Roger Federer survived a scare as the Wimbledon champion kicked off his bid for Olympic gold with a hard-fought 6-3, 5-7, 6-3 victory over Colombia's Alejandro Falla on Saturday.
Denis Istomin became the first player from Uzbekistan to reach the fourth round of a Grand Slam tournament on Friday, beating Alejandro Falla of Colombia 6-3, 6-4, 3-6, 7-6 (5) at Wimbledon.
Marathon man John Isner faded at the finish of another five-setter Monday at Wimbledon.
Thomaz Bellucci came back from two sets down to beat Alejandro Falla 2-6, 3-6, 6-1, 6-4, 6-3 on Friday, squaring the Davis Cup series against Colombia at 1-1.
Eighth-seeded American Mardy Fish became the biggest casualty in the men's singles draw as he crashed out in the second round of the Australian Open here on Wednesday.
Third seed Ukranian Alexandr Dolgopolov fought off a determined Alejandro Falla of Colombia to reach the second round of the Brisbane International on Sunday.
Argentina's Juan Ignacio Chela shattered Alejandro Falla's dreams of becoming the first Colombian man to reach a Grand Slam quarter-final with a five-set, last-16 French Open triumph on Monday.