Highs and lows from the Australian Open, so far

The first week of the Australian Open was a lot to take in. Stars fell, shoes nearly melted on the court and unexpected names plowed through the draw. Here is the best, and worst, so far:

Low: American losses on Day 1

The first day of the Happy Slam saw the elimination of three US Open semifinalists: Venus Williams, CoCo Vandeweghe and Sloane Stephens. The Americans also had losses from nine other players, including Jack Sock and John Isner, bringing their Day 1 record to 3-12.

High: Surprise Runs from New Faces

Lucky loser Bernarda Pera and 15-year-old Marta Kostyuk both made the third round, beating Johanna Konta and Peng Shuai respectively. Perhaps even crazier, 26-year-old main-draw rookie Tennys Sandgren and 21-year-old Next Gen Finals champion Chung Hyeon are both into the quarterfinals with wins over Stan Wawrinka, Dominic Thiem and Novak Djokovic. Let's not forget Kyle Edmund. The world No. 49 has stormed the semifinals for the first time with a stunning upset of Grigor Dimitrov in the quarterfinals.

Low: The Heat

Temperatures over 100 degrees on Day 4 and 5 compromised the quality of play, and caused people to call the current heat rule into question.

High: Plenty of Epic Early Matches

Between Jo-Wilfried Tsonga's five-set comeback win versus Denis Shapovalov; Nick Kyrgios' four-set, three-tiebreaker win over Tsonga; and Grigor Dimitrov's thrilling triumph over Kyrgios, there was tons of drama early in the week for fans to rejoice over.

Low: Wawrinka and Djokovic Not Quite Back to Full Form

Although Wawrinka and Djokovic took Roger Federer-style sabbaticals, the Federer-esque results haven't come yet. Wawrinka, five months removed from knee surgery, lost in the second round to Sandgren. And Djokovic, after falling in the fourth round to Chung, said his injured elbow was "not great."

High: Strong Women's Field in the Absence of Serena and Azarenka

The women's quarterfinals are rife with players due for a Grand Slam title. Half of the remaining players--Simona Halep, Karolina Pliskova, Angelique Kerber and Caroline Wozniacki—have held the WTA's No. 1 ranking. The most dangerous player of them all at the moment might be US Open finalist Madison Keys, who hasn't lost a set yet. She dispatched No. 8 seed Caroline Garcia in just over an hour.