'I'm really touched by Caltex's gesture. It was unexpected,' said Osman.
The 36-year-old father of two was also given a crystal trophy for Partnership Excellence - an inaugural award that will be given out annually henceforth.
The Caltex International general manager, Glenn Weckerlin, told the Strait Times that, 'We are not trying to undermine Zhang. We just want to reward Osman for a good job.'
Osman told the publication Timesport Tuesday that, 'When he gave me the $700, I didn't know what to say. I was too shocked. I wasn't expecting a lot, but this is far too low.'
Temporary caddies like Osman usually receive between 2 and 4 per cent of the player's winnings. Permanent caddies get 8 to 10 per cent.
Said Osman: 'When Zhang won, my friends teased me that I was going to get 10 per cent. I thought 5 per cent would be nice.'
Zhang gave him less than 0.5 per cent.
Osman brings home about $900 every month from his storekeeping job and another $800 to $900 from his weekends caddying at Laguna National Golf and Country Club.
Zhang, coincidentally, once was a caddie himself.
Will Osman carry Zhang's bag again?
He replied: 'I don't know. But even if I do, we have to sign an agreement first.'