Based in Portugal, photographer Pedro Mendes is capturing the later rounds of the ATP's Estoril Open for TENNIS.com. He can be reached on Twitter at @pedromendes, or at pedromendes.com.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

Japan's Taro Daniel goes full extension to retrieve a shot behind the baseline.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

In a more comfortable hitting position, the world No. 90 rips a backhand to opponent Pablo Carreno Busta.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

The Spaniard was in fine form. He defeated Daniel, 6-4, 7-5, in the Round of 16.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

Next up for Busta is a bout with Gilles Simon in the quarterfinals.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

Nicolas Almagro keeps his eye on the ball. What touch...

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

Across the net from the Spaniard was fourth-seeded Joao Sousa.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

Almagro upset Sousa in a three-set marathon, winning 4-6, 6-1, 6-2.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

The 27-year-old is now 5-13 on the season.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

Simon can rally with the best of them, and he loves to wear his opponents down.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

It worked on Thursday, as the Frenchman rallied to beat countryman Paul-Henri Mathieu, 3-6, 6-2, 6-1.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

Mathieu sets up to hit a one-handed backhand. He appeared to be in total control in the first set.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

But the veteran took just three games combined in the final two sets.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

Leonardo Mayer loves the one-handed backhand, too.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

Italy's Paolo Lorenzi goes with the more common two-handed shot. Look at that razor-sharp focus!

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

The 34-year-old lost the first set in a tiebreaker.

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PHOTOS: Thursday at the 2016 Estoril Open

PHOTOS: Thursday at the 2016 Estoril Open

Mayer squares the ball up and smokes a forehand. He won in straight sets.