Wimbledon Tennis 2013: Breaking Down Day 1's Biggest Upsets

To say Day 1 of Wimbledon 2013 featured some big upsets would be an understatement.

One of the favorites on the men's side suffered a historic loss, while a top-ranked player on the women's side was outclassed by a 19-year-old.

If you haven't heard of what happened on Day 1 at Wimbledon 2013, brace yourself. You are about to be shocked.

Steve Darcis d. (5) Rafael Nadal (7-6, 7-6, 6-4)

Steve Darcis' straight-set defeat of Rafael Nadal on Day 1 highlighted the day.

Darcis—the world No. 135—was 2-6 on the ATP Tour this year before Wimbledon 2013 and had won two singles titles in his career, but looked outstanding on Monday, registering 13 aces and 53 winners while capturing 74 percent of first-serve points, via Wimbledon.com.

Darcis' backhand was magnificent—taking advantage of the grass surface at the All England Club—while Nadal's backhand was, well, not. Nadal was constantly trying to run around balls to get to his forehand—he simply did not display a well-rounded game on Monday.

In fact, Darcis actually won a greater percentage of return points than Nadal (39 percent to 33 percent).

And, thus, Darcis handed the 27-year-old Spaniard his first first-round loss in a Grand Slam. This came after Nadal lost to Lukas Rosol in the second round of Wimbledon 2012.

It should be said that Nadal was battling a knee injury on Monday, per ESPN.com. His status moving forward is currently unclear.

Lleyton Hewitt d. (11) Stanislas Wawrinka (6-4, 7-5, 6-3)

Lleyton Hewitt came into Wimbledon with an 11-10 record in 2013, while No. 11 seed Stanislas Wawrinka boasted a 34-11 record with one singles title (Portugal Open). Wawrinka had defeated Andy Murray, David Ferrer (in the Portugal Open final), Tomas Berdych and Jo-Wilfried Tsonga headed into Wimbledon.

But Hewitt, a two-time Grand Slam singles champion (2001 U.S. Open, Wimbledon 2002), shocked Wawrinka on Monday, going on to a straight-set victory.

Discipline was the key for Hewitt. Wawrinka notched 12 aces and 44 winners, but also committed 37 unforced errors to Hewitt's 11, per Wimbledon.com.

Hewitt also won 60 percent of second-serve points and 42 percent of return points.

The 32-year-old Australian made the quarterfinals of Wimbledon 2009.

Monica Puig d. (5) Sara Errani (6-3, 6-2)

Sara Errani came into Wimbledon 2013 with a 36-14 record and one singles title (Acapulco) that included victories over Maria Sharapova, Agnieszka Radwanska and Maria Kirilenko.

On the other hand, Errani has never won a Grand Slam singles title and the 26-year-old Italian has never advanced past the third round at Wimbledon, so her loss to Monica Puig wasn't incredibly surprising on Monday.

That being said, Puig was ranked No. 65 on the WTA Tour headed into Wimbledon. This was also the 19-year-old's first career appearance at Wimbledon on the women's circuit. 

And this wasn't a close win. This was a blowout. Puig won 68 percent of first-serve points, 68 percent of second-serve points, 50 percent of return points and 50 percent of break points while racking up 38 winners, per Wimbledon.com.

Errani can't get out of England fast enough after that loss.