Tien keeps positive outlook after Next Gen ATP Finals: "I've had an extraordinary year".

The big winner of the Next Gen ATP Finals is João Fonseca.

The Brazilian defeated Learner Tien for the second time this week, this time in the final. The American had put in a fine performance, eliminating Arthur Fils in his final group match.

Nevertheless, the 19-year-old left-hander is determined not to let this defeat get him down, and to remember only the good times he's had so far this season.

Currently ranked 122nd in the world, Tien hopes to continue his progress over the coming months.

"I've had an extraordinary year. I've had a great week here in Saudi Arabia.

It didn't end as I'd hoped, but I'm proud of myself. I'm really happy with the progress I've made this year.

I think I played some really good tennis this week. I'm going to try to make sure that this defeat doesn't take me down a notch in terms of level.

I played some really good tennis and I'm looking forward to next year," Tien told the ATP website.