She made the quarterfinals in her tournament debut in 1997 and notched her first win over a top-10 player before losing to eventual champion Lindsay Davenport.
Del Potro's one-sided win lacked the drama of the earlier match as Canadian Raonic put up little fight against the Argentine's powerful serve and punishing forehand in a contest that lasted just over an hour.
Federer, who won his 20th Grand Slam title with his victory at Melbourne Park, was ruthless against his opponent once again on Thursday and took his unbeaten run this year to 16 matches, equalling his record from 12 years ago.
Victory was the 400th of the 29-year-old Del Potro's career, which has been interrupted by four wrist surgeries.
"I felt that (after saving break-point) that he was going to miss another opportunity".
'I consider myself extremely fortunate that I was able play professional tennis for a living for more than two decades, Haas said to an appreciative crowd that included retired greats Rod Laver and Pete Sampras.
In the women's singles, Venus Williams secured her spot in the semi-finals in Indian Wells for the first time since 2001.
That's when Federer dialed up the intensity with beautifully placed returns and prevailed in the first set 7-5.
After a few seasons quietly working his way up the world ranking, Chung has exploded onto the worldwide tennis scene this season, reaching the quarterfinals in five consecutive tournaments, starting with the ASB Classic in New Zealand in January.
"Saving break-point is always a good feeling - I felt good about it - gained a lot of confidence and solidified my lead".
"This might be the last day, so we'll see", Federer said, smiling. Daria Kasatkina of Russian Federation and Naomi Osaka of Japan, both 20, will meet in the women's final on Sunday after knocking out several higher-ranked players along the way. Federer went on to win a five-set final against Marin Cilic for his 20th Grand Slam title.
She advanced to the quarter-finals with a three-set win over world No. 2 Caroline Wozniacki, who won the Australian Open in January. The match had a packed stadium, and the match was watched on by the greats as well. I don't want people to think that I'm somebody really special. "I'm just trying to learn from Roger".
Del Potro last tasted victory over Federer in the US Open, knocking the 20-time Grand Slam victor out at the quarter-finals stage. "She is a legend", Kasatkina added.