American tennis legend Serena Williams recently retired from professional tennis. In her 27-year-long career, the 41-year-old faced many tough opponents. One of them was her own sister, Venus Williams. However, when we talk about rivalries, there’s hardly anyone who challenged Serena in her prime.

In a recent Reddit thread, people discussed various opponents who had a little rivalry with Serena. Also, they tried to figure out who among them was toughest opponent for Serena.

Who was Serena Williams’ toughest opponent?

Although Serena rubbed her shoulders with many tennis players in her long career, the fans still had a hard time picking one of them as the toughest. Here’s the question that had people talking about it.

“Who do you think was Serena Williams’ toughest opponent? – I think it is between Kim Clijsters, Justine Henin, and Lindsay Davenport. Who do you think it is (one of them or someone not on this list)?”

Here’s how fans reacted to it.

In reply to this, another fan wrote,

Another fan added two former world number 1 players, Martina Hingis and Venus Williams, to the list.

Another fan added Jennifer Capriati to the list.

Another fan voted for Henin.

Another fan gave a deeper insight into the reason why Serena dominated her elder sister Venus Williams.

Another fan wrote,

Poking fun in the conversation, another fan wrote mentioned, Maria Sharapova. The Russian was a great tennis player but has a terrible record against Serena.

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Another fan reacted,

One more fan went with Henin.

Speaking about the rivals from Serena’s days past her prime, a fan wrote about Naomi Osaka.

A fan got philosophical speaking about Serena’s anger on the court.

While the legend was out there on the tour for three decades, its hard to find out one single opponent who she found difficult to beat. Although the fans have given some big names in tennis, that did challenge Serena, she still had an upper hand over them.

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If we look at her records, the 41-year-old has the most number of Grand Slam titles in the open era. Is Serena the greatest of all time? Let us know your opinion in the comments section.