The two best examples of those modes in swimming may be Clark Smith (worried) and Michael Phelps (angry).
Clark Smith has two supportive parents (both of whom were world class swimmers), and seems like a nice guy. So he worries about disappointing everyone, from his parents to his coaches to his teammates.
As a result, his nerves sometimes get the better of him, and he chokes. He didn't do well in Budapest, failing to make the finals of both the 400 and 800 freestyles, in both cases going slower than he had at US Trials four weeks before.
Phelps came from a broken home, had a difficult relationship with his father, and appears to have a somewhat domineering mother. He has ADHD, was bullied as a kid, and is apparently a (reformed) alcoholic.
Phelps was known for feeding off of other peoples' disparagement. If anyone said something negative about him, or doubted him in any way, he would tape the newspaper clipping inside his locker.
Phelps swam angry. It was obvious because even after some of his victories, he still looked and acted angry. Watch his behavior from 1:26 to 1:43 of this video, when he beats Michael Cavic to set a world record in the 100 meter fly. His anger is what made him one of the best competitors (on top of being the most talented swimmer) ever.
Anger appears to be a better fuel for competitors than fear. It puts your psyche in the right place.
Marvin Hagler (who legally changed his name to Marvelous Marvin Hagler when promoters refused to bill him by that name) was known as a fighter who would work himself up into such a state of fury. (Hagler is shown below defeating Englishman Tony Sibson.)
Before the their fight in 1983, Hagler was asked about Sibson. He said, "I don't like that guy. He's been sayin' bad things about me. He's been running his mouth, and I'm going to shut it for him."
When informed of this, Sibson was mystified. He said, "I don't know where he got that from. All I've said about him publicly is that he's one of the four greatest middleweight champions of all time and that it's an honor to get in the ring with him."
Hagler wasn't a brain truster, but he knew how to get himself psyched up for a fight, and that was partly why he was such a great boxer.
Roberto Duran, another boxing legend, was also famous for hating all of his opponents.
But the point of this post is that even in the non-combat sports, and maybe even in other activities, it's better to compete furious than compete worried.If I were Clark Smith's coach, I'd advise him, before his races, to think of someone he really hates, and who hates him back. (We all have at least one person like that in our lives.) I'd say, think of how he'd like to see you fail. Think of how much pleasure that would give him. Think of that before your race, and while you're waiting behind the blocks. And think of how unhappy he'll be if he sees you win.
When I was young, I definitely fell into the worrier (as opposed to warrior) camp. And, I sometimes choked. There are a lot of things I wish I could have explained to the young me; this is one of them.