Stefanos Tsitsipas is one of the headline acts in tennis but, for some, simply saying his name is a challenge, which landed him on a list of the most mispronounced words of 2021 on Tuesday.

The list, compiled by the U.S. Captioning Company and commissioned by language-learning platform Babbel, is based on a poll of captioning professionals.

They identified frequently used, topical words that newscasters and people on television struggled to pronounce correctly this year.

World No. 4 Tsitsipas advanced to his first Grand Slam final at June's French Open, giving the 23-year-old Greek added exposure and sports commentators around the world a hard time.

Tsitsipas was not the only athlete to appear on the sixth edition of the list, after Philadelphia Eagles center Jason Kelce revealed in a radio interview that his teammates and the media had been mispronouncing his name for years.

The 11 other words that made the list included new COVID-19 strain Omicron and two cryptocurrencies — Dogecoin and Ethereum.

Slang term Cheugy," fast-food restaurant chain Chipotle, South Korean treat Dalgona, singer Billie Eilish and Suez Canal-blocking ship Ever Given also made the list.

Scottish city Glasgow, Chinese fashion company Shein and beauty filter trend Yassify rounded out the list.

"Newscasters in the U.S. have struggled with 2021's new words and names while reporting on key sporting events, viral internet trends and emerging celebrities," said Esteban Touma, a Babbel Live teacher.

"As a language teacher it's always interesting to see that some of these terms are usually new colloquialisms, or are rooted or borrowed from another language.

"And as a non-native speaker, I must confess it's fun to see English speakers stumbling a bit for a change."