Science and Baseball

Category: Uncategorized

A note on consulting opportunities…

This year was my first time visiting the MLB winter meetings. I was thrilled with the great conversations I had with various teams, media members, and other researchers. It’s a great thrill to hear about how your research is being implemented to help players better and healthier.

I would like to formally state, that I have no current MLB consulting agreements, and would welcome the opportunity to speak with any team about workload measurement, biomechanics assessments of pitchers, or any other applications where my expertise could be used to help you meet your goals.

Please reach out to my email,, or via Twitter – @DrMikeSonne

The Blue Jays best Stuff

I write a lot about Stuff on this site, with the goal of quantifying Stuff for the entire MLB. However, I am unabashedly, a Toronto Blue Jays fan first – and a Detroit Tigers fan (a distant) second. Part of the fun of using the PitchF/x data on the fangraphs site, is that I can look back in time, and figure out how different pitchers compare against each other. Also, if we’re looking to find out who had the best stuff in Blue Jays history – we can draw some inferences here. Fastball velocity has increased throughout league history, so it is reasonable to say that in the past 10 years, we have likely seen the best stuff in MLB pitcher history.

Let’s look at the Jays all time stuff leaderboard.

Overall Best Stuff

I’ve been writing stuff reports on the Jays pitchers over at Baseball Prospectus this season, so the top of this list shouldn’t be too shocking.  Aaron Sanchez may have the best Stuff in the history of the Blue Jays. My favourite arm in the top 10 has to be Brandon League – I loved watching him pitch for the Jays, despite his short comings (giving up bombs at inopportune times). I was a bit surprised to see Ricky Romero up as high he was – as I always viewed him as a command type pitcher. In reality, his pitch separation was elite, and he had decent change in speed. It’s a shame his knees gave up on him.

Best Stuff Seasons

Once again, Aaron Sanchez tops the list – but Joe Biagini comes in second, with his rookie season being the second best stuff season we`ve seen in the past 10 years for the Blue Jays. The biggest surprise I`m seeing is down near the bottom of the list. BJ Ryan sits in the negative with his stuff – and all I remember is him coming out of the bullpen and annihilating hitters with his fastball. Maybe it was the fact they put up flames on the video boards, more so than he was throwing flames?? I’ve been tricked again!

Ye Old Historic Stuff Report – 10 year anniversary


Every now and then, technological discoveries result in major breakthroughs in science. Certain things that come to mind are: the invention of the microscope and the discovery of insulin. While not in the same breath, the ability for me to split fangraphs queries by team, and by year, may go down as the biggest breakthrough that I have made.

You were probably sitting around, kicking your TV and swearing at your friends while watching the Jays game today – so don’t you want to think about the happier times? Like 2006?


TROY GLAUS and LYLE OVERBAY.12.27.2005. Slugger Troy Glaus and Lyle Overbay are all smiles at the introduction press meet at the Rogers Center Founders Club on Tuesday.(Rene Johnston/ Toronto Star Photo)

TROY GLAUS and LYLE OVERBAY.12.27.2005. Slugger Troy Glaus and Lyle Overbay are all smiles at the introduction press meet at the Rogers Center Founders Club on Tuesday.(Rene Johnston/ Toronto Star Photo)

Oh god, not that…

Let’s take a look at what pitchers, and what pitching staffs have had the best stuff since 2007. Also, let’s look into what starting rotations and bullpens had the highest workloads in the last ten years.


Ok, to truly qualify for these calculations, pitchers were required to appear in at least 5 games during the MLB season. To be considered a “true starter”, 80% of the innings a pitcher threw had to be in the starting rotation, and they could not have more than 9 relief innings in a season. To be considered a “true reliever”, 80% of the total innings had to be as a reliever, and the pitcher could not have more than 3 starts on the season. Are these rules unfair? LIFE IS UNFAIR.



The best stuff of any starting staff belongs to the 2011 Royals. A fearsome staff that managed to have only one pitcher with better than a 0.500 record, this staff was built on radar guns, and probably not on pitching ability. Luke Hochevar had the best stuff on this staff – and would eventually find a home in the bullpen.

In the time period studied (2007 – 2016),  the best average Stuff belonged to the Royals (an average stuff value of 0.84), followed by the Brewers, then the Cardinals.

The best individual stuff performance belongs to mine and Eno Sarris’s adopted son, Chris Bassitt. In 2016, Bassitt was putting up historic numbers before he sustained an elbow injury and had to have Tommy John Surgery. After that – it becomes the Jake Arrieta show. Before he put things together in 2015, Arrieta has exceptional stuff in 2014, as well as 2013. Sneaking into the top of that list is 2007 Rookie Ubaldo Jiminez.

Something really interesting to note – it has been well documented that fastball velocity keeps getting higher every year – and Tommy John Surgeries are also increasing. If you look at Stuff over these 10 years, the Stuff in 2016 is the highest it has ever been. There’s been a relatively linear increase in Stuff over the years, as you can see in this graph.



The Mariners 2013 bullpen had the best stuff in the past 10 years, lead by monster of Stuff, Tom Wilhelmsen (2.03). During the last decade, the best bullpen belonged to Tigers, followed by the Mariners and White Sox. Similar to the Stuff report for Starters, Stuff has increased over that time period for reliever as well (0.29 in 2007, and 0.52 in 2016).

We’ve seen some historic Stuff this season by resident piece of trash Arolids Chapman. In second and third place, a player near and dear to my heart – Joel Zumaya. I for one, fancied myself an experienced Guitar Hero player – so I can relate to the plight of Zumaya who hurt himself playing the iconic video game.

If you need access to these data because you’re curious about more – let me know! I’d be happy to share it with anyone. If you think the metric is wrong – well, go jump off a bridge and make your own Stuff metric.

© 2024 Mike Sonne

Theme by Anders NorenUp ↑