I believe that in everyone's student era, there are such students: they study hard, they are well-behaved students in the eyes of teachers and parents, but their grades are generally not the most top-notch.

Perhaps that's the case with Nikola Davydenko from Russia, who was affectionately known as a "model worker" by fans before his official retirement in 2014.
Davydenko, who is 1.80 meters tall, is not outstanding in stature and strength, and his tennis talent and technical characteristics are not very prominent, but the efforts of the Russians have made up for their own shortcomings.
Diligence is the best interpretation of Davidenko.
In a russian's more than a decade-long career, he is supposed to be the most diligent top player in the world, and every year during the tennis season and weekly tour events, Davidenko's name will almost always appear on a certain event signing list.
This is one of the reasons why Davidenko has been able to stabilize his ranking in the top 10 for a long time, and Russia has been ranked in the top eight in the world from 2005 to 2007.
Has Davidenko achieved anything? In the face of such an excellent ranking, many fans have questioned this, and even more questioned the strength of the Russian, believing that he does not deserve such a high ranking.
Of course, Davidenko did not care about these doubts, he still maintained his own rhythm of playing, although he did not win a Grand Slam singles championship trophy until his retirement, the Russians still achieved a number of outstanding results.
Among them are three Masters titles including Paris, Miami and Shanghai, the 2009 ATP Year-end Finals and four Grand Slam Final Four experiences.
In Doha in 2010, Davidenko continued his excellent performance at the end of the previous season, first beating world number one Federer in the semi-finals and reversing Nadal in the first set in the final.
Winning the tournament in the same race, Lenkfiner, is undoubtedly one of the highest performances of the Russian's career, writing his career with his own diligence in an era of giants.
In 2014, at a press conference at the Moscow Bank Kremlin Cup, a hometown event, Davidenko officially announced his imminent retirement.
"I'm 33 years old now, and although I haven't won a Grand Slam title or become the world number one, I don't have any regrets..." At this point, a generation of labor models officially bid farewell to the fans. (Source: House of Tennis Author: Barbie)