Daniel Diehl Blasts 53.11 100 Back To Crack 17-18 National Age Group Record


  • November 30-December 3, 2022
  • Greensboro Aquatic Center, Greensboro, North Carolina
  • Long Course Meters (50 meters)
  • Start Times:
    • Prelims: 9 AM (ET)
    • Finals: 6PM (ET)
  • Psych Sheets
  • How to Watch
  • Live Results

It was only a matter of time, but Daniel Diehl officially took hold of the U.S. boys’ 17-18 National Age Group Record in the 100 backstroke (LCM) on Friday.

Competing in the prelims of the U.S. Open in Greensboro, N.C., Diehl blasted his way to a time of 53.11, erasing the nine-year-old NAG record of 53.38 set by six-time Olympic medalist Ryan Murphy in 2013.

Diehl breaking Murphy’s record was essentially a forgone conclusion after he went under the mark while he was still 16, having broken the 15-16 NAG back at the Junior Pan Pacific Championships in August in 53.27. That swim marked the third time Diehl reset the 15-16 NAG record, which he initially took hold of from Murphy in March 2022 when he went 53.59 to break Murphy’s 53.76 swim from 2012.

Having aged up in October, the now 17-year-old Diehl rocketed out to an opening split of 25.87 during the U.S. Open prelims, the only split in the field sub-26, but he really made inroads on the back-half, closing in a blistering 27.24 to mark the quickest in the field by more than a second.

Relative to his previous best time, the second 50 was the difference-maker for Diehl, as he closed almost half a second quicker.

Split Comparison

Diehl, Junior Pan Pac Prelims Diehl, Junior Pan Pac Final Diehl, U.S. Open Prelims
25.69 25.57 25.87
53.40 (27.71) 53.27 (27.70) 53.11 (27.24)

*Splits for Diehl’s 53.59 swim are unavailable

The YMCA of Cumberland product maintains his place as the 14th-fastest American of all-time, and will have a chance to become the 12th U.S. man sub-53 in tonight’s final.

All-Time U.S. Performers, Men’s 100 Backstroke (LCM)

  1. Ryan Murphy, 51.85 – 2016 Olympic Games
  2. Aaron Peirsol, 51.94 – 2009 Summer Nationals
  3. Hunter Armstrong, 51.98 – 2022 World Championships
  4. Matt Grevers, 52.08 – 2012 Olympic Trials
  5. David Plummer, 52.12 – 2016 Olympic Trials
  6. Nick Thoman / Shaine Casas, 52.51 – 2009 U.S. Open / 2022 Speedo Southern Sectionals
  7. Randall Bal, 52.59 – 2008 Eindhoven Open
  8. Justin Ress, 52.73 – 2022 International Team Trials
  9. Bryce Mefford, 52.87 – 2021 Olympic Trials Wave II
  10. Jacob Pebley, 52.95 – 2016 Olympic Trials
  11. Michael Phelps, 53.01 – 2007 Summer Nationals
  12. Ben Hesen, 53.03 – 2012 Olympic Trials
  13. Daniel Diehl, 53.11 – 2022 U.S. Open
  14. Ryan Lochte, 53.37 – 2008 Olympic Trials

Despite only having recently turned 17, Diehl is one of just four swimmers to go under 54 seconds in the boys’ 17-18 age group.

All-Time U.S. Performers, Boys 17-18 100 Backstroke (LCM)

  1. Daniel Diehl, 53.11 – 2022 U.S. Open
  2. Ryan Murphy, 53.38 – 2013 Summer Nationals
  3. Michael Taylor, 53.77 – 2016 Olympic Trials
  4. Gunner Grant, 53.89 – 2019 World Juniors
  5. Jack Aikins, 54.03 – 2021 Olympic Trials Wave II

After placing 31st in the 100 back at the 2021 U.S. Olympic Trials at the age of 15, Diehl has made a massive leap over the last year and a half. After his 15-16 NAG record swim in March, he finished eighth in the 100 back at the International Team Trials in April, and then won the event at the Junior Pan Pacs in August while adding three more gold medals on the American relays.

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2 months ago

he’s gonna go 52 in finals bruh

2 months ago

Word on the street is that Diehl is taking his immense talents to Dallas join the Mustangs of SMU

Reply to  Andrew
2 months ago

You’re going the wrong way down a one way street

2 months ago

Haven’t seen the race yet but I’m just hoping he wasn’t moving all around the lane during the race. I doubt it since it’s inside but in any case congrats dirtydan

This Guy
2 months ago

This is bonkers! Congratulations to the kid, unreal stuff. The future is bright

About James Sutherland

James Sutherland

James swam five years at Laurentian University in Sudbury, Ontario, specializing in the 200 free, back and IM. He finished up his collegiate swimming career in 2018, graduating with a bachelor's degree in economics. In 2019 he completed his graduate degree in sports journalism. Prior to going to Laurentian, James swam …

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