During 2010 many top-ranked tennis pros stumbled, falling from stupendous heights while their lower-ranked opponents accomplished the seemingly impossible.
Such surprising results makes tennis a fascinating sport because on any given day a No. 1 seed may fall to someone ranked 84.
The top 20 tennis players, men or women, are not separated from the rest of the field primarily by talent. More than likely the top players win consistently because of that elusive ability to close out matches and capture critical points.
The will to win is often the determining factor in most matches. Sometimes, however, that drive to win takes a joy ride, leaving the higher-ranked player stranded, unable to pull out the victory.
This catalog of upsets reviews those matches that made our jaws drop, our astonishment meters rocket while our credulity stretched to accept the results.
The winner of the match was not expected to win by fans, pundits or bookies.
Counting down the top 25. Disagreements are encouraged. Weigh in.