WATCH: Alexander Zverev & Arthur Fils get into heated argument in Hamburg final, chair umpire steps in to stop fight

Controversy erupted during the final match at the Hamburg Open between Alexander Zverev and Arthur Fils as the Frenchman attempted an underarm serve. The duo got into a heated argument and the chair umpire intervened to quell the matter.

The incident occurred during the third set at 5-5 30-40, with Zverev having a break point. Fils attempted an underarm serve which was initially called in but the decision was corrected by the umpire.

The 20-year-old managed to save the break point as the German hit the return out wide on the second serve. Fils was then subjected to boos from Zverev's home crowd, who were firmly in the German's corner.

Zverev commented on the attempted underarm serve and allegedly said that the young Frenchman had 'zero respect'. During the changeover, the two engaged in a heated debate and the umpire had to intervene to stop the argument from escalating.

Later, Fils defeated Zverev in the decisive tiebreak. As the two opponents approached the net, the German offered the 20-year-old a frosty handshake, with minimal eye contact. Post the handshake, Zverev shook his head in apparent disbelief and even shared a few words with the umpire.

However, the duo buried the hatchet and celebrated the biggest title of Arthur Fils' career with champagne in the presentation ceremony.

Arthur Fils' win over Alexander Zverev in the Hamburg Open 2024 final gives him his 2nd career title

Alexander Zverev at the 2024 Italian Open (Source: GETTY)

Arthur Fils stunned the defending champion and home hero Alexander Zverev to lift the title at the Hamburg Open. The 20-year-old started strong by breaking serve in the second game of the match. He then held his own serve, despite Zverev having numerous break point opportunities, to clinch the first set 6-3.

The defending champion came back strong in the second set as he got a crucial break in the sixth game and won the set to level the match.

Both the players held their serve in the third set, with Zverev having multiple break point opportunities but not being able to capitalize on them. Over the course of the entire match, the German was offered 22 break point opportunities but he only managed to break Fils' serve once.

Fils showed his dominance in the tiebreak as he cliched it 7-1 to win the final, with the final score reading 6-3, 3-6, 7-6(1)

This is Arthur Fils' second career title, with the first being the 2023 Lyon Open. The win will help him break into the top 20 of the ATP rankings.