Dan, who is a double Olympic champion and considered by many to be the greatest of all time, does not play many tournaments anymore and at 31 he is one of the older players on the circuit.
He has not been in his best form at in England, and his game has appeared to lack some of his usual pace.
Dan acknowledged his struggle, and after his opening match against Wei Nan, he said: "I was a little bit rusty. Maybe it takes time. I feel a little bit out of form and I have to adapt. The match was a little but difficult for me. I will take the lessons of this away and think about them, and work out how to play tomorrow.
"Since the scoring changes of 2006 there has been a narrowing of the gap between the stronger and the weaker players. It has become more competitive."
In his next match he Lin defeated Chinese compatriot Tian Houwei 21-15, 21-19, but it wasn't all his way against 24-year-old opponent. He said he can learn from playing against younger players.
Dan added: "To have the correct attitude is crucial when you come up against these talented players. Being a professional athlete, we all want to win the title. I can also learn from them and I'm more than happy to face the challenges they pose."
Next up for the former world number one is a match up against Japan's Kento Momota.