Some may say that honor belongs to Mackenzie McDonald; however, I disagree. [1] Rafael Nadal was clearly hampered. Jenson Brooksby served for the match three times in the third set. However, the American finally won in an almost 4-hour match, 6-3, 7-5, 6-7(4), 6-2. In his first venture to the Australian Open, the American is making a statement.

Embed from Getty Images

The Other American Success Stories

[67] J.J. Wolf knocked out a potentially dangerous opponent. [23] Diego Schwartzman could not solve the riddle called Wolf and lost 1-6, 4-6, 4-6. [113] Katie Volynets defeated [9] Veronika Kudermetova 6-4, 2-6, 6-2. Lucky loser [107] Michael Mmoh defeated a recently recovered [12] Alexander Zverev. Mmoh won 6-7(1), 6-4, 6-3, 6-2.

Twenty-year-old, [89] Ben Shelton is having fun in Australia. Shelton took out the qualifier, [154] Nicolas Jarry, 7-6(3), 7-6(3), 7-5. [35] Tommy Paul had a battle on his hands against [30] Alejandro Davidovich Fokina. The Spaniard led two sets to one before Paul upped his game. In the end it was a much more comfortable victory for the American, 6-2, 2-6, 6-7(4), 6-3, 6-4. Unfortunately, Paul plays countryman Brooksby in the next round.

Embed from Getty Images

Seeds That Were Upset On Day 4

[2] Ons Jabeur is out of the Australian Open. Jabeur was also hampered with a knee injury. The number two seed lost to [86] Marketa Vondrousova 1-6, 7-5, 1-6. [16] Anett Kontaveit continues to struggle with her form, and lost 6-3, 3-6, 4-6 to the veteran [45] Magda Linette. This was a nice win for [64] Donna Vekic, who has been struggling with her form following an injury. Vekic defeated [20] Liudmila Samsonova 6-3, 6-0. [27] Irina-Camelia Begu lost to the brainy German, [158] Laura Siegemund. Siegemund won 5-7, 7-5, 6-3.

Embed from Getty Images

American [8] Taylor Fritz got bounced by the Australian wildcard, [113] Alexei Popyrin. Popyrin won 6-7(4), 7-6(2), 6-4, 6-7(6), 6-2. [14] Pablo Carreno Busta simply lost his way, which is somewhat surprising, but anything is possible in tennis. The Spaniard led 2-0 sets and lost in five sets to [48] Benjamin Bonzi. The Frenchman won 4-6, 4-6, 7-6(5), 6-1, 7-6(10-4).

ALL IMAGES COURTESY OF GETTY IMAGES