Four players in the official Top 100 year-end rankings were in exactly the same position as they had been in the official 2017 year-end rankings: Simona Halep, Caroline Wozniacki, Lara Arruabarrena and who else?

Which player dished out 11 bagel sets in main draw matches in 2018 - the record for the season?

Prior to the Asian swing, only one player won a WTA tournament without dropping a set. Who was it and where?

Which 2018 title-winner has won all of her WTA titles while ranked outside the Top 100?

Which country gained its first ever WTA main draw win in 2018?

Serena Williams lost to Naomi Osaka twice in 2018. How many losses had she previously suffered at the hands of Japanese players?

Olga Danilovic became the first Lucky Loser to win a WTA title at the Moscow River Cup in July. Who had beaten the Serbian teenager in the final round of qualifying?

Who were the only two players to notch up completed victories over each of 2018's Grand Slam champions - Caroline Wozniacki, Simona Halep, Angelique Kerber and Naomi Osaka - this year?

Former World No.2 Agnieszka Radwanska retired at the end of 2018. Who did she defeat in her final match win?

Tatjana Maria had a successful grass season, winning her maiden title in Mallorca and capturing her first Top 5 victory over Elina Svitolina at Wimbledon. Prior to Mallorca, how many match wins had she totalled in the 14 tournaments she had played in 2018?

Which player reached the second week of a major for the third time in the past four Slams in 2018 - having only reached that stage once in the 21 Grand Slam main draws she contested before 2017?

2018 saw two WTA Tour finals contested between compatriots. Which countries were responsible?

Which player upset a Top 30 player as a qualifier in each of her first two WTA main draws this year?

Which of this year's four Premier Mandatory champions lost the fewest games en route to the trophy?

Which 2018 title-winner ended the year with a winning record in WTA main draws - but a losing record in WTA qualifying, WTA 125s, ITFs and Fed Cup play?

17. Garbiñe Muguruza lost to World No.202 Karolina Muchova in the second round of the US Open. When was the last time Muguruza had lost to a player ranked outside the Top 200?

18. Who was the only 2018 Grand Slam champion to have an unbeaten record this season against her fellow 2018 major winners?

Of the year-end Top 20, which player saved the most number of match points en route to victories in 2018?

Naomi Osaka backed up her US Open win with a run to the Tokyo final. How many other first-time major winners this millennium (since 2000) have also reached the final of their next tournament?

Which of this year's junior Grand Slam champions also made her WTA main draw debut in 2018, reaching the quarterfinals?

Less than a year after making her WTA-level debut and just 10 months after cracking the Top 100, which player racked up a first appearance in a Grand Slam second week, a major seeding and a maiden WTA title in 2018?

Who was the youngest player to win a WTA main draw match in 2018?

Which year-end Top 100 player had the greatest numerical upwards leap from their 2017 year-end position?

Who ended the career of a former Top 10 player for the second time when she defeated Roberta Vinci in Rome?