| 100% | POETS | 5 | "The only poor fellows in the world whom anyone will flatter": Pope |
| 45% | BERRA | 5 | Yogi who was catcher in the only perfect World Series game |
| 41% | ROCKYMARCIANO | 13 | Boxer from the 50s who is the only world heavyweight champion in professional boxing to retire undefeated: 2 wds. |
| 41% | MICHAEL | 7 | ___ Schumacher, retired German racer who is the only racer in history to win seven Formula One World Drivers' Championships |
| 41% | MARX | 4 | Philosopher who wrote, “The philosophers have only interpreted the world, in various ways. The point, however, is to change it” |
| 40% | ASHE | 4 | Person for whom the largest tennis arena in the world is named |
| 40% | ELON | 4 | Musk who is currently the second-richest person in the world |
| 40% | ELON | 4 | Musk who is the richest person in the world |
| 39% | USAIN | 5 | ___ Bolt, Olympic sprinter who is the fastest man in the world |
| 39% | PELE | 4 | One-named sports star who was once the highest-paid athlete in the world |
| 38% | ANA | 3 | Tennis player Ivanovic who was ranked No. 1 in the world in 2008 |
| 38% | YESTERDAY | 9 | 2019 musical-fantasy film starring 17-Across, 27-Across, and Himesh Patel as a singer who is the only person in the world who remembers the Beatles |
| 38% | TYRANT | 6 | "The only ___ I accept in this world is the still small voice within me": Gandhi |
| 38% | BURJKHALIFA | 11 | "What am I bungeeing off of? Only the tallest building in the world.... Psych!" |
| 38% | BAER | 4 | Boxer Max who was world heavyweight champion in the thirties |
| 38% | MADISON | 7 | Pitcher Bumgarner who was the World Series MVP in 2014 |
| 37% | SANIA | 5 | ___ Mirza, retired Indian tennis star who was ranked No. 1 in the world in doubles |
| 37% | NEPAL | 5 | Its flag is the only non-rectangular one in the world |
| 37% | WAHLBERG | 8 | Mark who was the world's highest-paid actor in 2017 |
| 37% | THEATER | 7 | "The only institution in the world which has been dying for four thousand years," per John Steinbeck |
| 37% | ALCAPP | 6 | Cartoonist whom John Steinbeck said "may very possibly be the best writer in the world today" |
| 37% | CRICKET | 7 | I have thin wings and long legs. I chirp only in the night. Who am I? |
| 37% | PIUSII | 6 | 15th-century pontiff who was the only pope to write an autobiography |
| 37% | EFFA | 4 | Manley who is the only woman in the Baseball Hall of Fame |
| 37% | REGGIE | 6 | Jackson who was on five World Series-winning teams in the 1970s |
| 36% | PEONY | 5 | Lush flower found only between April and July that is amongst the most expensive in the world |
| 36% | FATHERTIME | 10 | Scythe carrier who is also said to be undefeated in the sports world |
| 36% | CHARLIESIFFORD | 14 | Color-barrier-breaking golfer in the World Golf Hall of Fame who was born in 1922 (2 wds.) |
| 36% | SUE | 3 | Bird who is the only player to win WNBA titles in three different decades |
| 36% | TINATURNER | 10 | "Private Dancer" singer who has a solo in "We Are the World": 2 wds. |