Welcome to my blog and thank you for following me!

With great pleasure I take you into my world as a triathlete. Triathlon, and everything that comes with it, has become my passion and occupies an important part in my life, therefore I´d like to give you a bit of my enthusiasm!

I started blogging to take family and friends with me on my trip to my first Ironman on Lanzarote on the 20th of May 2017 and, via Ironman Maastricht on the 6th of August, I took not only family and friends but also many other supporters and followers on my road to the World Championship Ironman Hawaii on the 14th of October 2017. A dream has become reality at lightning speed!

I kept on dreaming of going back to Hawaii to become World Champion in my agegroup in a few years, but it only took me one… I’ve been through an amazing season and performed better than ever on World Championship Hawaii on the 13th of Ocotber 2018. In a new course record of 9:36:27 I became WORLD CHAMPION in agegroup 30-34.

2019 was my first year as professional triathlete and it’s like the story continues. The big dream was to qualify for Hawaii, which is quite a challange as a pro. With an incredible race at Ironman Malaysia on the 24th of October, I took the win and secured my slot for the world championships in 2020! Unfortunately this has to wait another year as the world of triathlon has standing still because of COVID19. It’s the date that is changed, not the goal!

Follow my road here! Enjoy the ride 😀

About me

What started out as ‘Tessa who had to start exercising with pleasure again’ quickly grew into a fanatical, groundbreaking Tessa, but still with a lot of fun!

I grew up in Voorhout, a small village near the westcoast of The Netherlands, as the youghest of a sportive family with 3 brothers and a sister. I went on with swimming after I learned it as little kid. My grandpa Egbert van ’t Oever was well known in the ice speedskating world, so soon the ´irons´ were tied around my feet. At the age of 11 I discovered the roadbike and changed my swimsuit for it. Two years later I won the National Youth Championships and putted on the Dutch red-white-blue jersey, a year later I successfully defended it!

With skating, on my 18th, I made the switch from ´long track´ to marathons, I wasn´t good enough on the short distance. After a successful first year, I was unfortunately struck by Pfeiffer’s disease, a virus in my blood what made me very tired all day long. Since then I´ve never been able to reach the level that I had before and I lost the fun in the sport. I just messed up a little, but in one way or another I wasn´t happy about it either. In early 2016 I decided to become a member of the triathlon club. I thought this maybe should make me come back into the right flow. From that moment everything started and went on with a hugh speed, which I sometimes couldn´t follow…

I participated in some popular competitions in the region and climbed on the podium time after time. I became more and more fanatic and my converted race / time trial bike really wasn´t good enough anymore. There has to become a new one so I could get even harder! I started at the Dutch Championship Triathlon 1/2 distance (1.9km swimming, 90km cycling and 21km running) and finished 4th in my agegroup! After two more races with this distance it quickly didn´t felt like a real challenge anymore. Time to become an: Ironman! 3.8km swimming, 180km cycling and 42km running! With the ultimate goal to qualify for the World Championships on Hawaii! I set my goals on Ironman Lanzarote 2017, but didn´t made it to the finishline (dehydrated). I learned my lesson, recovered quickly and went on for Ironman Maastricht-The Netherlands two months later. I was rewarded after hard work: winner in my agegroup and qualified for WC IRONMAN HAWAII!

Still as an agegrouper in 2018, I followed nearly the same steps as the season before, but with my new coach I made a huge progress. I had a good race at Ironman Lanzarote, my hometown now. Again some stomach problems on the run, but it wasn’t good enough for qualification for WC Hawaii anyway. I became 2nd in my agegroup. Again I decided to race Ironman Maastricht to qualify, which happened in a nearly perfect race and a personal best! We head of to triathlonheaven Hawaii again and for this you really have to read my racereport / blog. In a new course record of 9:36:27 I became WORLD CHAMPION agegroup 30-34!

I decided to go for the real work and turned PRO in 2019. At Ironman South Africa I had a great debute and became 6th in a strong field of professionals. Again I wanted to shine on Lanzarote, but mecanical problems on the bike messed up my race. While I tried to recover some time on the bike, I actually destroyed my legs and was unable to run a strong marathon. Full focus was on the national championships long distance in The Netherlands, but unfortunately I had to pull out halfway the bike leg because of stomach problems, which I already had during the raceweek. I cleared my mind and decided to travel to Malaysia for the Ironman as I didn’t wanted to finish my season with a DNF. What happened there still feels like it was a dream. In the last part of the marathon I took the lead and I crossed the finishline as the IRONMAN MALAYSIA CHAMPION! And with this victory I secured my slot for the World Championships on Hawaii!

A dream is coming true but I must be patient, the edition of 2020 is cancelled, but the goal is still there: October 9, 2021!

Race calender & Results

Races 2019

26 – 29 january – MTB 4-stages Lanzarote – WINNER

17 february – Ocean Lava Tenerife – WINNER

24 februari – Ultrabike Lanzarote – WINNER

8 – 9 march – Desafio La Graciosa – WINNER

7 april – IRONMAN South Africa – 6th

27  april – CHALLENGE Gran Canaria – 2nd

4 may – Volcano Lanzarote – 2nd

25 may – IRONMAN Lanzarote – 8th

14 july – 🇾🇪 Championship half distance – 3rd

25 august – Ironman 70.3 Ireland – 4th

13 september – Challenge Almere (🇾🇪champs) – DNF

5 october – IRONMAN 70.3 Lanzarote – 5th

26 october – Ironman Malaysia – WINNER + Qualification Kona

23 november – Swimrun Lanzarote

Races 2018

3 – 6 february – MTB 4-stages Lanzarote – WINNER agegroup / 9th elite

17 february – Graciosa offroad triathlon – sprint – 2th

17 march – Tri122 Lanzarote – 1/2 distance – 3th

25 march- Ultrabike Lanzarote – 82 km – 2th

15 april – Nutricross – sprint – WINNER

28 april – Volcano triathlon – olympic distance – 2th

26 may – IRONMAN LANZAROTE – 2th agegroup / 10th overall


1th agegroup / 4th overall / 2nd Dutch championship

1 september – World Championship IRONMAN 70.3 Zuid-Afrika – 4th agegroup

13 october – World Championship Ironman Hawaii – Full distance

WORLD CHAMP AG30-34 / 32th overall

27 october – Ocean Lava Lanzarote – 1/2 distance – WINNER

24 november – SwimRun Lanzarote – WINNERS WOMEN TEAM







Tri122 Lanzarote – 3th


WineRun Lanzarote – 3th

Trail La Vegueta – 2th

Transajaches Trail – WINNER

Ocean Lava Lanzarote – 3th


Canarias Series Arrecife – 5th

Ironman 70.3 Lanzarote – 2th


Alphen a/d Rijn – WINNER


Tri Rosas offroad triatlon – WINNER

Swimrun Lanzarote – 2th mix team

Marathon Lanzarote – 5th