Table 1: The average fantasy point earnings, disaggregated by position, wins, and losses.

Position - Losses - Wins - Both

Carry - 11.6 - 17.7 - 15

Mid - 13.3 - 17.8 - 15.9

Offlane - 8.97 - 11.8 - 10.6

Soft Support - 12 - 14.2 - 13.3

Hard Support - 13.1 - 15 - 14.1




Pick players from teams that will play the most games that day (bo3 = 2 games, bo5 = 3 games). More games means more fantasy points. The difference between high-scoring players and low-scoring players is very rarely big enough to account for the loss of points from playing a lower number of games. Don't bother trying to account for whether a bo3 will go to 3 games, because only the highest scoring 2 games of a bo3 are counted (highest scoring 3 for a bo5).

Pick players from teams that are expected to win their matches. Carry players are the worst offenders, scoring on average ~52% more points in wins when compared to losses. This is followed by mid and offlane players, who score ~34% and ~32% more respectively. Soft and hard support players are the least affected, scoring just ~18% and ~14% more respectively. You should still prioritise teams that play the most games.

Pick carry players for the Core slots. You have both carry and offlane players available to you, but carry players score on average ~42% more than offlane players.

Pick hard support players for the Support slots. Hard support players score on average ~7% more than soft support players. This is admittedly much closer than the previous comparison and primarily depends on the proportion of observer wards planted. In some teams, the soft support plants a larger portion of the observer wards, in which case it would tip the scales in their favour.

Keep at least one bronze card for each player (even offlane players). On the final day of the main stage, there will be the bo3 lower bracket final followed by the bo5 grand finals. In all likelihood, you will want to pick all the players from the team that you think will play both series (refer the first bullet point). This is when that offlane card will be useful.

Table 2: The top players for each slot, in the format: name / team tag / position / average score.

Core
SumaiL / OG / Carry / 16.7
Raven / Fnatic / Carry / 16.5
Timado / UND / Carry / 16.4
Arteezy / EG / Carry / 16.3
Yatoro / TSpirit / Carry / 16.2
23 / T1 / Carry / 15.9
Costabile / SG / Carry / 15.8
YS / QCY / Carry / 15.4
Nightfall / VP / Carry / 15.4
Monet / Aster / Carry / 15.1

Mid
Bryle / UND / Mid / 17.3
gpk~ / VP / Mid / 16.9
Karl / T1 / Mid / 16.9
Abed / EG / Mid / 16.6
TORONTOTOKYO / TSpirit / Mid / 16.6
LIMMP / Alliance / Mid / 16.5
Emo / IG / Mid / 16.3
Ori / VG / Mid / 16.1
NothingToSay / PSG.LGD / Mid / 16.0
Quinn / QCY / Mid / 16.0

Support
DuBu / UND / Hard / 16.6
DJ / Fnatic / Hard / 16.0
Whitemon / T1 / Hard / 15.4
Saksa / OG / Soft / 15.4
YapzOr / Secret / Soft / 15.3
Fng / Alliance / Hard / 15.1
y` / PSG.LGD / Hard / 15.1
N0tail / OG / Hard / 15.0
KJ / SG / Hard / 14.9
LoA / QCY / Hard / 14.9

The most important bonuses for each position,
in the format: category name / percentage of total fantasy point earnings.

Carry
Tower kills / 18.4
Deaths / 14.1
Kills / 14.0
Teamfight / 12.3


Mid
Runes grabbed / 17.1
Kills / 13.8
Teamfight / 13.0
Deaths / 12.4
Stuns / 10.1


Offlane
Teamfight / 18.5
Deaths / 15.5
Stuns / 13.4
Kills / 12.9


Soft Support
Stuns / 18.8
Obs wards / 18.4
Teamfight / 14.8
Camps stacked / 11.0
Deaths / 10.1


Hard Support
Obs wards / 38.2
Teamfight / 13.2
Camps stacked / 10.9


In general, these are the bonuses you should be looking for for each position. I have only listed the categories that account for more than 10% of total fantasy point earnings. Of course, it will change from player to player, and if you are interested in a specific player, I encourage you to explore the data yourself. Once again, keep in mind some of the limitations mentioned previously.