Notre Dame?defensive lineman Jerry Tillery apologized Monday for his actions in Saturdays loss at?USC,?in which the sophomore appeared to nudge one injured Trojans player in the head and step on the foot of another during a fourth-quarter drive.Tillery nudged the helmet of USC running back?AcaCedric Ware?with his cleat while Ware was down after a hit by Irish safety Nicco Fertitta, who was ejected for targeting. Tillerys move went unnoticed by officials in the Irishs?45-27 loss.Tillery was later flagged for an unsportsmanlike conduct penalty after he stepped on the exposed foot of?Zach Banner?while the Trojans offensive tackle was on the ground.I want to take full responsibility for my actions on Saturday, Tillery said in a statement posted to his Twitter account. I am truly sorry. I acted in a way that was out of character for me. What I displayed in those two instances were completely unbecoming and not indicative of the kind of player or person I am. My actions in those instances do not represent what my family or Notre Dame has molded me to be.I want to especially apologize to AcaCedric, Zach, their families and anyone else affected by what I did. I assure you I will learn and grow from this moment and become a better man because of it.Ware and Banner took to Twitter to acknowledge and accept Tillerys mea culpa.Notre Dame coach Brian Kelly told reporters after the game that he would speak with Tillery.I did not [see the plays], Kelly said. I know he got a personal foul penalty, and I subsequently took him out of the game. I had a conversation with him. Any time a player has a personal foul penalty, I pull them out and have a conversation with them. I did that with Jerry, but I did not see [the plays].Accountability is built within any program. Jerry has to be accountable for his actions every single day. Jerry is a good kid, and if he made a mistake, well hold him accountable for that mistake. Well take a look at it. 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Authentic Ultra Boost .Y. -- Jayna Hefford scored the winning goal Friday as Canada survived a scare with a 4-3 win over Sweden at the Four Nations womens hockey tournament.Lewis Hamilton has identified securing pole position as critical to his prospects of delaying, or even derailing, Nico Rosbergs title push at this weekends Brazilian GP. The German driver will be crowned world champion on Sunday evening if he claims his third successive victory at Interlagos. Rosbergs success at Sao Paulo is in sharp contrast to his team-mates struggles: Hamilton, whose helmet this weekend has been adorned with a tribute to his idol Ayrton Senna, has never won in Brazil. Why hasnt Hamilton won the Brazilian GP? While the odds thus far appear to be stacked against Hamilton, the world champion has recently rediscovered his mojo in adversity, winning the US and Mexican GPs to cut Rosbergs title lead to 19 points after the German had surged 33 points clear a month ago when he won in Japan.But what Hamilton needs now is his first-ever win at Interlagos - and to heed a lesson from history. In 2014 and 2015, Rosberg claimed pole ahead of Hamilton by less than a tenth of a second with the Englishman then enduring a pair of frustrating race days around the narrow and overtaking-unfriendly Interlagos circuit.You have to have a really big delta to the car in front here [to overtake], Hamilton told Sky Sports F1. The last two years Ive been right up behind the back end of the car in front and its been impossible to overtake.Position is everything this weekend so l will be gunning for pole position. Hamilton seized the early iniative in Friday practice, edging out Rosberg at the top of the timesheets in both sessions. But the margins separating the two Mercedes drivers pointed to a closely-fought contest this weekend - after Hamilton beat Rosberg by two tenths of a second in Practice One, Rosberg was just a few hundreths behind in Practice Two.It remains distinctly possible Hamilton will end the season with four consecutive victories to finish 2016 as the moral champion while Rosberg will be crowed the bona-fide champion merely by cruising to second place in both Brazil this Sunday and the campaign-concluding Abu Dhabi GP.But Hamilton will take no solace in any expression of superiority over his team-mate unless its sufficient to claim his fourth world championship.Nobody remembers if you were the ultimate best driver, they just remember who was the champion, said Hamilton. Im not looking at anything other than winning the races. Its a simple viewpoint. Nevertheless, Hamilton must know his cause would be greatly assisted if either Red Bull or Ferrari join the fight at the front to complicate Rosbergs progress.dddddddddddd As Red Bull chief Christian Horner put it: We can be Lewis best friend this weekend.Whens the Brazilian GP on Sky F1?Mercedes team principal Toto Wolff rounded on Max Verstappen two weeks ago for his rough handling of Rosberg in Mexico, arguing you could say Max should have got a penalty for banging the wheels with the championship leader in Turn One and pushing him off the track, but the prospect of either Verstappen or his Red Bull team-mate Daniel Ricciardo treating either world championship combatant with kid gloves this Sunday is remote.Just because they are fighting [for the title] doesnt mean we shouldnt try to make an overtake, said Ricciardo. I drive respectfully but I will race hard. If there is an opportunity to win I will go for it.Even in his own single-minded pursuit of victory, the potential usefulness of those sentiments are unlikely to have been lost on Hamilton. Martin Brundle sits down with Bernie Ecclestone for an exclusive interview at his Brazilian ranch. Watch the full version on Sky F1 this weekend Can Nico Rosberg clinch the title at Interlagos? Watch the Brazilian GP live on Sky Sports F1 on Sunday, the race begins at 4pm; Watch the whole race weekend with a NOW TV week pass - £10.99, no contract Also See: Merc unhappy with Verstappen The Formula 1 Gossip column Why hasnt Lewis won Brazil? ' ' '