Four golfers are named Mr. Blue, Mr. Black, Mr. Brown, and Mr. White. They were contending in a golf tournament. The caddy was unaware about their identities, so he asked them their names.

• The 1st golfer responded, "The 2nd golfer is Mr. Black."
• The 2nd golfer replied, "I am not Mr. Blue."
• The 3rd golfer said, "Mr. White? That's the 4th golfer."
• The 4th golfer remained silent.

It is known that Mr. Brown is a liar, who always lies. Each of the other three golfers is a knight, who always speaks truthfully.

Which one of the golfers is Mr. Blue?