Stefanos Tsitsipas defeats Alex de Minaur in four sets to claim the Next Gen ATP Finals crown.

Stefanos Tsitsipas celebrates with ball kids after lifting the Next Gen ATP Finals trophy on Saturday.

Stefanos Tsitsipas and Alex de Minaur both entered the Next Gen ATP Finals championship match with a 4-0 record this week.

Stefanos Tsitsipas celebrates defeating Alex de Minaur in four sets at the Next Gen ATP Finals on Saturday.

Stefanos Tsitsipas won 72 per cent of service points en route to victory over Alex de Minaur at the Next Gen ATP Finals on Saturday.

Alex de Minaur saves seven of eight break points in four-set loss to Stefanos Tsitsipas at the Next Gen ATP Finals on Saturday.

Stefanos Tsitsipas captures the Next Gen ATP Finals trophy after beating Alex de Minaur in four sets on Saturday.

Stefanos Tsitsipas and Alex de Minaur meet in the Next Gen ATP Finals championship match on Saturday.

Andrey Rublev receives the third place trophy after beating Jaume Munar at the Next Gen ATP Finals on Saturday.

Jaume Munar saves 10 of 12 break points in five-set loss to Andrey Rublev at the Next Gen ATP Finals on Saturday.

Andrey Rublev defeats Jaume Munar in five sets to finish in third place at the Next Gen ATP Finals on Saturday.

Jaume Munar warms up for his match against Andrey Rublev at the Next Gen ATP Finals on Saturday.

Stefanos Tsitsipas and Alex de Minaur both own 4-0 records at the Next Gen ATP Finals in Milan.

Stefanos Tsitsipas is presented with the Most Improved Player of the Year Award after beating Andrey Rublev at the Next Gen ATP Finals on Friday.

Andrey Rublev won 75 per cent of first-serve points (43/57) during his five-set loss to Stefanos Tsitsipas at the Next Gen ATP Finals on Friday.

Stefanos Tsitsipas defeats Andrey Rublev in five sets to reach the championship match at the Next Gen ATP Finals on Friday.

Andrey Rublev wins 80 per cent of first-serve points in the fourth set to force Stefanos Tsitsipas into a decider at the Next Gen ATP Finals on Friday.

Stefanos Tsitsipas heads to the side of the court to use his towel during his semi-final match against Andrey Rublev at the Next Gen ATP Finals on Friday.

Alex de Minaur will meet Stefanos Tsitsipas or Andrey Rublev for the Next Gen ATP Finals trophy on Saturday.

Alex de Minaur defeats Jaume Munar in five sets to reach the championship match at the Next Gen ATP Finals on Friday.

Jaume Munar saves four consecutive match points to force a deciding fifth set against Alex de Minaur at the Next Gen ATP Finals on Friday.

Jaume Munar has twice beaten Alex de Minaur, below tour level, in Spain.

Alex de Minaur advanced to the semi-finals in Milan with a 3-0 record in Group B.

Stefanos Tsitsipas saves five of five break points in straight-sets win over Hubert Hurkacz at the Next Gen ATP Finals on Thursday.

Hubert Hurkacz won 56 per cent of second-serve return points (9/16) against Stefanos Tsitsipas at the Next Gen ATP Finals on Thursday.

Alex de Minaur talks with his coach, Adolfo Gutierrez, during his final Group B match against Taylor Fritz at the Next Gen ATP Finals on Thursday.

Taylor Fritz dropped just two points behind his first serve (25/27) in straight-sets loss to Alex de Minaur on Thursday.

Stefanos Tsitsipas defeats Hubert Hurkacz in straight sets to win Group A with an undefeated 3-0 record at the Next Gen ATP Finals on Thursday.

Alex de Minaur defeats Taylor Fritz in straight sets at the Next Gen ATP Finals on Thursday.

Frances Tiafoe meets young fans at the Tag Heuer booth at the Next Gen ATP Finals on Thursday.

Andrey Rublev signs autographs and meets fans after defeating Liam Caruana at the Next Gen ATP Finals on Thursday.

Liam Caruana wins 72 per cent of first-serve points in straight-sets loss to Andrey Rublev on Thursday.

Nicola Pietrangeli attends Day Three action at the Next Gen ATP Finals on Thursday.

Andrey Rublev beats Liam Caruana in straight sets to end Group B with a 2-1 record.

Jaume Munar will qualify for the semi-finals in Milan if Stefanos Tsitsipas defeats Hubert Hurkacz on Thursday.

Frances Tiafoe finishes the Next Gen ATP Finals with a 1-2 record.

Jaume Munar defeats Frances Tiafoe in straight sets at the Next Gen ATP Finals on Thursday.

Frances Tiafoe will face Jaume Munar in his final Group A match at the Next Gen ATP Finals on Thursday.

Taylor Fritz speaks with his coach during his second Next Gen ATP Finals match against Liam Caruana on Wednesday.

Stefanos Tsitsipas earns his second victory at the 2018 Next Gen ATP Finals by defeating Frances Tiafoe.

Alex de Minaur saves four of five break points en route to four-set victory over Andrey Rublev at the Next Gen ATP Finals on Wednesday.

Andrey Rublev won 60 per cent of second-serve return points in four-set loss to Alex de Minaur at the Next Gen ATP Finals on Wednesday.

Alex de Minaur defeats Andrey Rublev in four sets at the Next Gen ATP Finals on Wednesday.

Stefanos Tsitsipas converted both break points he created en route to three-set win over Frances Tiafoe at the Next Gen ATP Finals on Wednesday.

Frances Tiafoe won 80 per cent of first-serve points in three-set loss to Stefanos Tsitsipas at the Next Gen ATP Finals on Wednesday.

Stefanos Tsitsipas fires 21 winners to beat Frances Tiafoe in straight sets at the Next Gen ATP Finals on Wednesday.

Liam Caruana won 80 per cent of service points (12/15) in the first set against Taylor Fritz at the Next Gen ATP Finals on Wednesday.

Liam Caruana won 80 per cent of service points (12/15) in the first set against Taylor Fritz at the Next Gen ATP Finals on Wednesday.

Taylor Fritz beats Liam Caruana in four sets at the Next Gen ATP Finals on Wednesday.

Hubert Hurkacz saves six of nine break points in five-set win over Jaume Munar at the Next Gen ATP Finals on Wednesday.

Taylor Fritz defeats childhood friend Liam Caruana for his first win this week in Milan.

Alex de Minaur meets fans after beating Liam Caruana in three sets at the Next Gen ATP Finals on Tuesday.

Liam Caruana saves six of 10 break points in three-set defeat to Alex de Minaur at the Next Gen ATP Finals on Tuesday.

Alex de Minaur beats Liam Caruana in 55 minutes at the Next Gen ATP Finals on Tuesday.

Frances Tiafoe defeats Hubert Hurkacz in four sets at the Next Gen ATP Finals on Tuesday.

Hubert Hurkacz saved all five break points he faced to win the third set of his Next Gen ATP Finals clash against Frances Tiafoe on Tuesday.

Frances Tiafoe and ATP Executive Chairman and President Chris Kermode chat at the Next Gen ATP Finals on Tuesday.

Taylor Fritz saves 13 of 16 break points in five-set loss to Andrey Rublev at the Next Gen ATP Finals on Tuesday.

Jaume Munar saves six of eight break points in four-set loss to Stefanos Tsitsipas at the Next Gen ATP Finals on Tuesday.

Stefanos Tsitsipas wins 56 per cent of second-serve return points against Jaume Munar at the Next Gen ATP Finals on Tuesday.

The 2018 Next Gen ATP Finals field will contest 15 matches over five days of competition at the Fiera Milano from 6-10 November.

Spain's Jaume Munar has had the best season of his young career in 2018.

Liam Caruana defeats Raul Brancaccio to complete the 2018 Next Gen ATP Finals field.

Hubert Hurkacz has lifted two ATP Challenger Tour trophies this year.

Taylor Fritz, the 2016 ATP Star of Tomorrow presented by Emirates, is one of two Americans competing at the 2018 Next Gen ATP Finals.

Andrey Rublev owns 17 tour-level victories this season.

Jaume Munar and Frances Tiafoe will both make their Next Gen ATP Finals debuts this year.

Chris Kermode, ATP Executive Chairman & President, discusses innovations for the Next Gen ATP Finals.

Hyeon Chung, winner of the first Next Gen ATP Finals in 2017, feels his "win in Milan will always be very special to me.”

Hyeon Chung, winner of the first edition of the Next Gen ATP Finals, looks on as Angelo Binaghi, President of the Italian Tennis Federation, details advancements to this year's event.

Hubert Hurkacz defeats Jaume Munar on Wednesday to earn his first win of the 2018 Next Gen ATP Finals.