The Swedes were unlucky with various penalties - which gave them tough extra time in the hunt for a top spot.
Ericsson was forced to go to the depot when the depot was closed, and was punished with extra time.
In a position when he was at the top of the race.
- We have been one of the fastest cars this month.
We also made a good start and had a good result in progress.
But then came this yellow flag.
Our fuel ran out, and had to go into the depot, and then the depot was closed, and then you get a penalty.
So instead of being fifth, I was 29th after the first depot stop, says Marcus Ericsson to SVT Sport.
Ericsson could, however, in the end rejoice in becoming the best Swede with a final eleventh place.
Rosenqvist eight laps before goal
Felix Rosenqvist, in turn, drove too fast in the depot at the depot stop, and was punished with extra time.
- It must have been extremely little over, like 0.1 kilometers, so I was quite shocked actually.
That's how the rules are, but it feels sour, says Felix Rosenqvist to SVT Sport.
Rosenqvist was in the lead with eight laps left (out of 200 in total) - but was forced to a fuel stop, and then the chances of victory also disappeared.
What had saved Rosenqvist at that stage was if the safety car came out on the track, but it never did.
- We took a chance on a "fuelsave" (save fuel) at the end and hoped that the safety car would come out again, but it never happened, and then I had to go to the depot again, and then we came out far behind instead, says Felix Rosenqvsit.
The winner was 46-year-old Brazilian Helio Castroneves - who became historic with his fourth victory in the Indy 500.